Haberman, Richard, author
Society for Industrial and Applied Mathematics, 1998
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Newman, Edward I., author
Blackwell Science, 1993
Buku Teks
Tucker, Alan, author
John Wiley & Sons, 1980
Buku Teks
Bajpai, Avi C., author
John Wiley & Sons, 1983
Buku Teks
Wilson, Andrew, author
Brown, 1968
Buku Teks