edited by G. Adomian
Academic Press, 1980
Buku Teks
Narayan Bhat, U.
John Wiley & Sons, 1972
Buku Teks SO
Osaki, Shunji
Springer-Verlag, 1992
Buku Teks SO
Lamberton, Damien
Chapman & Hall/CRC , 2008
Buku Teks
Hardle, Wolfgang Karl
Springer , 2012
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