C Sagan1. Show Affiliations » 1. YERKES OBSERVATORY, UNIVERSITY OF CHICAGO, WILLIAMS BAY, WISCONSIN.
Abstract
Year: 1960 PMID: 16590618 PMCID: PMC222849 DOI: 10.1073/pnas.46.4.393
Source DB: PubMed Journal: Proc Natl Acad Sci U S A ISSN: 0027-8424 Impact factor: 11.205