G D Birkhoff1, B O Koopman. Show Affiliations » 1. Department of Mathematics, Harvard University.
Abstract
Year: 1932 PMID: 16587677 PMCID: PMC1076207 DOI: 10.1073/pnas.18.3.279
Source DB: PubMed Journal: Proc Natl Acad Sci U S A ISSN: 0027-8424 Impact factor: 11.205