Chukwu, E.N., author
Academic Press, 1992
Buku Teks
Akulenko, Leonid D., author
Kluwer, 1994
Buku Teks
Whittle, Peter, author
John Wiley & Sons, 1990
Buku Teks
Lions, J.L., author
Society for Industrial and Applied Mathematics, 1972
eBooks
Barbu, Viorel, author
Academic Press, 1993
Buku Teks