Media type: E-Article Title: Conway's ZIP Proof Contributor: Francis, George K.; Weeks, Jeffrey R. imprint: Informa UK Limited, 1999 Published in: The American Mathematical Monthly Language: English DOI: 10.1080/00029890.1999.12005061 ISSN: 0002-9890; 1930-0972 Origination: Footnote: Access State: Open Access