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Buku Teks
edited by Panos M. Pardalos, Themistocles M. Rassias
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eBooks
Elsevier Science Inc., 665, 2018
Majalah, Jurnal, Buletin
Goldstein, Larry Joel
Prentice-Hall, c1984.
Buku Teks
Martin, George Edward
Springer-Verlag, 1982
Buku Teks