Application of the Markov chain approximation to the sunspot observations Mustafa önal OriginalPaper Pages: 107 - 115
Estimates of the number of sunspot groups: Application to the activity cycle 1960–1970 Mustafa önal OriginalPaper Pages: 117 - 121
Organic-chemical clues to the theory of impacts as a cause of mass extinctions N. J. Sack OriginalPaper Pages: 131 - 143
Modelling the 5–30 Μm spectrum of Comet Halley N. C. WickramasingheM. K. WallisF. Hoyle OriginalPaper Pages: 145 - 153
Hydromagnetic turbulence in cometary plasmas N. N. RaoU. N. RaoA. C. Das OriginalPaper Pages: 155 - 163
A periodical analysis of the cosmic-ray diffusion coefficient and the high-speed solar-wind streams J. XanthakisH. MavromichalakiA. Vassilaki OriginalPaper Pages: 165 - 179
Photoelectric observations of the occultation of 136 tauri by Venus E. H. GeyerM. Hoffmann OriginalPaper Pages: 181 - 185