1969/09/01 by Carl Sagan · 2 citations
Physics and Astronomy · #Planetary Science and Exploration #Space Science and Extraterrestrial Life #Space exploration and regulation
paper · doi:10.1016/0019-1035(69)90052-9
crossref issued 1969/09/01 · crossref published 1969/09/01 · crossref published-print 1969/09/01 · openalex publication_date 1969/09/01 · crossref created 2002/11/11 · crossref deposited 2019/04/03 · crossref indexed 2022/04/03 · openalex created_date 2025/10/10 · openalex updated_date 2025/11/06