Pontificiae Academiae Scientiarum scripta varia


1	58 Study week on the impact of space exploration on mankind : proceedings of a study week held October 1-5, 1984 / edited by Carlos Chagas and Vittorio Canuto pbk. - Città del Vaticano : Pontificiae Academia Scientiarum , 1986
2	35 Study Week on Nuclei of Galaxies ; April 13-18, 1970 / Edited by D. J. K. O'Connell Amsterdam : North Holland Pub. Co.. - New York : American Elsevier Pub. Co. , 1971