editor, F.T Arecchi and E.O. Schulz-Dubois
North-Holland, 1972
Buku Referensi
Galloway, Lee
Alexander Hamilton Institute, 1914
Buku Teks
Richard D. Irwin. Inc, 1992
Buku Teks SO
Roemer, Milton I.
Oxford University Press, 1993
Buku Teks
Stakgold, Ivar
Society for Industrial and Applied Mathematics, 2000
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