Eckavs, Richard S., author
MIT Press, 1968
Buku Teks
Ottesen, Johnny T., author
Society for Industrial and Applied Mathematics, 2004
eBooks
Rachma Fitriati, author
[publiser not identified], 2011
Artikel Jurnal
edited Charles R. Blitzer, Peter B. Clark and Lance Taylor
Oxford University Press, 1977
Buku Teks
Livingston, John Leslie, author
McGraw-Hill, 1970
Buku Teks