E Hopf1. Show Affiliations » 1. Harvard College Observatory.
Abstract
Year: 1932 PMID: 16577437 PMCID: PMC1076166 DOI: 10.1073/pnas.18.1.93
Source DB: PubMed Journal: Proc Natl Acad Sci U S A ISSN: 0027-8424 Impact factor: 11.205