The relative abundance of the carbon isotopes12C and13C in primary cosmic radiation G. JönssonK. KristianssonL. Malmqvist OriginalPaper Pages: 231 - 251
Further observations of the filamentary nebulosity around the cetus Arc (Loop 2) K. H. ElliottJ. Meaburn OriginalPaper Pages: 252 - 260
Exchange of gravitational energy during a collision of galaxies K. Shankara SastrySaleh Mohamed Alladin OriginalPaper Pages: 261 - 271