R Courant1. Show Affiliations » 1. Department of Mathematics, New York University.
Abstract
Year: 1938 PMID: 16588200 PMCID: PMC1077037 DOI: 10.1073/pnas.24.2.97
Source DB: PubMed Journal: Proc Natl Acad Sci U S A ISSN: 0027-8424 Impact factor: 11.205