Eckavs, Richard S.
M.I.T. , 1968
Buku Teks
International Institute For Applied Systems Analysis, 1981
Buku Teks
Ottesen, Johnny T., author
Society for Industrial and Applied Mathematics, 2004
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Roberts, Richard A., 1935-, author
Massachusetts Addison-Wesley, 1992
Buku Teks
Lannoy, Richard
The Vanguard Press, 1955
Buku Teks