Antal, M., Cervak, G., Klobusnik, J., Pittich, E.M., Rychtarcik, P., Schalling, P., Svoren, J.: 1989, `Precise positions of comets', Minor Planet Circ., 14081-14083. Antalova, A., Jakimiec, M.: 1989, `Geometric properties of solar flares and their energetics', Bull. Astron. Inst. Czechosl. 40, 311-320. Antalova, A.: 1989, `Supplement of the Catalogue of LDE flares (July 1986-June 1988), Part 2', Contrib. Astron. Obs. Skalnate Pleso 18, 41-70. Antalova, A.: 1989, `Vyvojove charakteristiky protonovych erupcii', in: Vztahy Slunce-Zeme III, ed. V. Bucha, Geofyzikalni ustav CSAV, Praha, pp. 83. Babadzhanov, P.B., Hajduk, A., Obrubov, J.V., Puskarev, A.N.: 1989, `Evoljucija meteornogo roja komety Galleja', in: Komety i meteory, No 41, Akad. Nauk Tadzik. SSR. Bakos, G.A., Tremko, J.: 1989, `Light curve of the ellipsoidal variable HD 1826', Contrib. Astron. Obs. Skalnate Pleso 18, 17-21. Belyakina, T.S., Bondar, N.I., Gershberg, R.E., Chochol, D., Chuvaev, K.K., Efimov, Y.S., Grygar, J., Hric, L., Krasnobabtsev, V.I., Piirola, V., Poutanen, M., Savanov, I.S., Houvelin, J., Tuominen, I., Shakhovskaya, N.I., Shakhovskoy, N.M., Shenavrin, V.I., Shcherbakov, A.G.: 1989, `The Kuwano-Honda's peculiar object (PU Vulpeculae)in 1983 - 1986.', Astron. Astrophys. 223, 119-135. Cervak, G., Fabricius, J., Klobusnik, J., Pittich, E.M., Rychtarcik, P., Schalling, P., Svoren, J.: 1989, `Precise positions of comets', Minor Planet Circ., 15130-15135. Duchlev, P., Dermendjiev, V., Velkov, K., Rusin, V.: 1989, `Statistical Investigation of the Height of Prominences at the Lomnicky Stit Coronal Station in the Period 1967-1986', Bull. Astron. Inst. Czechosl. 40, 109-118. Hajduk, A., Cevolani, G.: 1989, `Variations in radar reflections from meteor trains and physical properties of meteoroids', in: Asteroids, Comets, Meteors III, eds. C. I. Lagerkvist, B. A. Lindblad, M. Lundsten, H. Rickman, Uppsala Univ., Uppsala, pp. 527-530. Hajduk, A., Hajdukova, M.: 1989, `From the formation of meteor streams up to their decay', in: Asteroids, Comets, Meteors III, eds. C .I. Lagerkvist, B. A. Lindblad, M. Lundsten, H. Rickman, Uppsala Univ., Uppsala, pp. 531-534. Hajduk, A., Stohl, J., Cevolani, G.: 1989, `Multiple reflections from meteor trails and small-scale wind structure', Il Nuovo Cimento 12, 315-334. Hric, L., Juza, K.: 1989, `Premenne hviezdy', in: Astronomicka rocenka 1989, ed. E. Pittich, Obzor, Bratislava, pp. 168-181. Hric, L., Skopal, A.: 1989, `Call for a campaign of long-term photometry of symbiotic stars', Inf. Bull. Variable Stars 3364, 1. Hudec, R., Valnicek, B., Tremko, J., Wenzel, W., Goetz, W., Roessiger, S., Kraicheva, Z., Patkos, L.: 1989, `The nature of dips in the light curve of TT Arietis', in: Variable phenomena in close binary systems, ed. L. Patkos, Konkoly Observatory, Budapest, pp. 244-248. Kreiner, J.M., Tremko, J.: 1989, `Period changes in the close binary system QQ Cassiopeae', in: Variable phenomena in close binary systems, ed. L. Patkos, Konkoly Observatory, Budapest, pp. 275-278. Kreiner, J.M., Tremko, J.: 1989, `Research into the close binary QQ Cassiopeae with the primary component of the early spectral type', Contrib. Astron. Obs. Skalnate Pleso 18, 7-15. Kresak, L., Klacka, J.: 1989, `Selection effects of asteroid discoveries and their consequences', Icarus 78, 287-297. Kresak, L., Kresakova, M.: 1989, `The absolute magnitudes of periodic comets I. Catalogue', Bull. Astron. Inst. Czechosl. 40, 264-289. Kresak, L.: 1989, `Comets going this way and that...', Sky and Telesc. 78, 565-566. Kubacek, D.: 1989, `Komety roka 1988', in: Astronomicka rocenka 1990, ed. E. Pittich, SUAA, Hurbanovo, pp. 208-217. Kubacek, D.: 1989, `Komety', in: Astronomicka rocenka 1990, ed. E. Pittich, SUAA, Hurbanovo, pp. 108-140. Kubacek, D.: 1989, `Komety', in: Hvezdarska rocenka 1990, ed. P. Prihoda, Academia, Praha, pp. 187-201. Kubacek, D.: 1989, `Obloha v gama ziareni, 2. cast', in: Astronomicka rocenka 1990, ed. E. Pittich, SUAA, Hurbanovo, pp. 218-232. Kucera, A.: 1989, `Spektroskopicky vyskum slnecnych flokul.(thesis)', SAV, Malotirazne Stredisko, Tatranska Lomnica. Pittich, E.M., Sitarski, G.: 1989, `Graficzne predstawienie residuov O-C i orbit kometv Katalogu orbit komet jednopojawieniowych', in: Dynamika Malych Cial Ukladu Slonecznego, ed. K. Ziolkowski, CBK PAN, Warszawa, pp. 25-30. Pittich, E.M., Svoren, J.: 1989, `Comet observations made at the Skalnate Pleso Observatory in the years 1977-1980', Contrib. Astron. Obs. Skalnate Pleso 18, 23-30. Pittich, E.M.: 1989, `O mozhliwoshci uwzglednienia predkoshci wyrutu meteorov w rozhladzie wielkich osi meteorov nalezhacych do roju', in: Dynamika Malych Cial Ukladu Slonecnego, ed. K. Ziolkowski, CBK PAN, Warszawa, pp. 49-57. Porubcan, V., Simek, M., Mcintosh, B.A.: 1989, `Lyrid meteor stream:Long-term activity profile', Bull. Astron. Inst. Czechosl. 40, 298-302. Porubcan, V.: 1989, `Meteoricke roje', in: Astronomicka rocenka 1990, ed. E. Pittich, Obzor pre SUAA, Krajsku hvezdaren v Hlohovci a Slovensku Astronomicku spolocnost, Bratislava, pp. 104-107. Rusin, V., Dzifcakova, E.: 1989, `North-South Asymmetry of the Green and Red Coronae over Cycle 21', Bull. Astron. Inst. Czechosl. 41, 69-79. Rusin, V., Rybansky, M., Dermendjiev, V., Buyukliev, G.: 1989, `Corona - prominence interface as seen in H-alpha', Hvar Obs. Bull. 13, 81-86. Rusin, V., Rybansky, M.: 1989, `Unusual Coronal Activity between Cycles 21 and 22', Bull. Astron. Inst. Czechosl. 41, 263-268. Rusin, V., Rybansky, M.: 1989, `Zelonaja i krasnaja korony v cykle 21', in: Solnechnyje magnitnije polja i korona. Trudi XIII Konsultativnogo soveschanija po fizike Solnca, Nauka, Sibirsk. otde., Novosibirsk, pp. 242-251. Rusin, V., Zverko, J.: 1989, `Vrashchenije zelenoj korony v cykle 21', in: Solnechnyje magnitnije polja i korona. Trudi XIII Konsultativnogo soveschanija po fizike Solnca, Nauka, Sib. otdelenie, Novosibirsk, pp. 350-358. Rusin, V.: 1989, `Dynamics of Solar Prominence on December 7, 1978', Hvar Obs. Bull. 13, 119-126. Rybansky, M., Rusin, V., Dzifcakova, E.: 1989, `Coronal Index of Solar Activity 1987', Bull. Astron. Inst. Czechosl. 41, 79-81. Rybansky, M., Rusin, V., Dzifcakova, E.: 1989, `Coronal Index of Solar Activity Va (1977-1980 years)', Contrib. Astron. Obs. Skalnate Pleso 18, 81-274. Rybansky, M.: 1989, `Problemy interpretacii nabljudenij solnechnoj korony', in: Solnechnyje magnitnyje polja i korona/1, ed. /, NAUKA, Moskva, pp. 221-226. Shcherbakova, Z.A., Shcherbakov, A.G., Tuominen, I., Rybansky, M., Rusin, V., Dzifcakova, E.: 1989, `The HeI Line as an Indikator of Solar Chromospheric Activity', in: Solnechnyje magnitnije polja i korona. Trudi XIII Konsultativnogo soveschanija po fizike Solnca, Nauka, Sibirskoje ot., Novosibirsk, pp. 51-56. Skopal, A., Mikolajewski, M., Biernikowicz, R.: 1989, `Radial velocities and line profiles in spectrum of CH Cyg 1982-1984', Bull. Astron. Inst. Czechosl. 40, 333-366. Skopal, A.: 1989, `New outburst of the symbiotic star CH Cyg', Inf. Bull. Variable Stars, 1-3. Skopal, A.: 1989, `Photometry of the active and quiescent phase of CH Cyg', Contrib. Astron. Obs. Skalnate Pleso 18, 31-40. Sobelman, I.I., Zhitnik, I.A., Valnitshek, B., Rybansky, M. ET AL.: 1989, `Solnetshnyj rentgenovskij teleskop i pervyje eksperimentalnyje dannyje', in: Solnetshnyje magnitnyje polja i korona/2, ed. /, NAUKA, Moskva, pp. 342-352. Svoren, J.: 1989, `Planetky - urcovanie priemerov', in: Astronomicka rocenka 1990, ed. E. Pittich, Obzor, Bratislava, pp. 141-153. Sykora, J.: 1989, `Contributions of the Astronomical Observatory Skalnate Pleso 10, 11, 12, 13, 14, 15, 16, 17, 18, (1981-1989) - Scientific editor', Contrib. Astron. Obs. Skalnate Pleso 10-18. Sykora, J.: 1989, `Nekotorye aspekty krupnomasshtabnykh i dolgovremennykh projavlenij solnechnoj korony', in: Solnechnye magnitnye polia i korona, ed. R.B. Teplitskaja, Nauka (Sibirskoe otdelenie), Novosibirsk, pp. 203-220. Valsecchi, G.B., Carusi, A., Knezevic, Z., Kresak, L., Williams, J.G.: 1989, `Identification of asteroid dynamical families', in: Asteroids II, eds. R. P. Binzel, T. Gehrels, M. S. Matthews, Univ. Arizona Press, Tucson, pp. 368-385. Zverko, J., Bychkov, V.D., Ziznovsky, J., Hric, L.: 1989, `A search for rapid variability in radial velocity and effective magnetic field of the rapidly oscillating Ap star Gamma Equ', Contrib. Astron. Obs. Skalnate Pleso 18, 71-79. Zvolankova, J.: 1989, `Kozmonautika v rokoch 1985-1987', in: Astronomicka rocenka 1990, ed. E. Pittich, Obzor, Bratislava, pp. 233-257.