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Instability considerations at self-gravitating circumplanetary ringlet structures E. WillerdingH. J. Fahr OriginalPaper Pages: 121 - 139
Periodic activity of Comet Bradfield 1987s Jun-Ichi WatanabeTakumi Abe OriginalPaper Pages: 141 - 147
The Rayleigh-Taylor instability in a self-gravitating two-layer fluid sphere Shigeru IdaYoshitsugu NakagawaKiyoshi akazawa OriginalPaper Pages: 149 - 174
Evening and morning twilight enhancement of λ5577 Å atomic oxygen line at Allahabad N. ShrivastavaS. ShrivastavaA. N. Shrivastava OriginalPaper Pages: 181 - 190
Imaging Fabry-Pérot observations of [OI] 6300 Å emission in the coma of Halley's comet 1982i C. Debi PrasadJ. N. Desai OriginalPaper Pages: 191 - 195
Variation in comet P/Halley P. S. GorayaH. K. DuggalWahab Uddin Letter to the Editor Pages: 197 - 198
Comparison of enhanced Mariner 9 and Viking imagery of Mars for analysis of short term geological phenomenon Kent D. Trego Letter to the Editor Pages: 199 - 206