Nono Anwar Makarim, author
Harvard Law School, 1978
Buku Teks
editor, F.T Arecchi and E.O. Schulz-Dubois
North-Holland, 1972
Buku Referensi
Galloway, Lee, author
Alexander Hamilton Institute, 1914
Buku Teks
Richard D. Irwin. Inc, 1992
Buku Teks
Stakgold, Ivar, author
Society for Industrial and Applied Mathematics, 2000
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