scientific article (publication date: May 1955)
scholarly article by Leonard Gillman & Melvin Henriksen published September 1954 in Transactions of the American Mathematical Society
doctoral dissertation by Leonard Gillman
article published in 1975
scientific article (publication date: February 1956)
scientific article published in December 1959
article
article by Leonard Gillman published January 1992 in American Mathematical Monthly
scientific article (publication date: June 2002)
scientific article published in 2002
scholarly article
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