Brown, Curtis M.
John Wiley & Sons, 1981
Buku Teks
Foreign languages press, 1962
Buku Teks
Jagota, S.P.
Martinus Nijhoff , 1985
Buku Teks
Lagnese, John E.
Society for Industrial and Applied Mathematics, 1989
eBooks
Duffy, Dean G.
Chapman & Hall/CRC , 2008
Buku Teks SO