A Proof of non-existence of (d,k)-digraphs for d=2,k>3
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Nollen, Stanley D.
Alternative work schedules an AMA survey report Stanley D. Nollen and Virginia H. Martin
New York Amacon c.1978,
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Lieu, D.K.
China's economic stabilization and reconstruction / by D. K. Lieu
Rutgers University Press, 1948
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Abhyankar, K.D.
Astrophysics : stars and galaxies / K. D. Abhyankar
Tata McGraw-Hill, 1992
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Eisenhower, Dwight D.
Public papers of the presidents of The United States / Dwight D. Eisenbower
Federal Register Division, National Archives and Records Service, 1958
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