1933/12/01 by E. R. van Kampen · 1 citation
paper · doi:10.1007/bf02940628
crossref issued 1933/12/01 · crossref published 1933/12/01 · crossref published-print 1933/12/01 · crossref created 2008/08/30 · crossref deposited 2019/05/21 · crossref indexed 2026/07/30