Free and direct objects
Open Access
- 1 January 1963
- journal article
- Published by American Mathematical Society (AMS) in Bulletin of the American Mathematical Society
- Vol. 69 (1) , 63-66
- https://doi.org/10.1090/s0002-9904-1963-10860-5
Abstract
References [Enhancements On Off] (What's this?)Keywords
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