Levy, George C., author
John Wiley & Sons, 1980
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Williams, David A.R., author
ACOL, 1986
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Alfaiz Fahrurrachman, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2022
UI - Skripsi (Membership)
Artikel Jurnal
Sandstrom, J., author
Academic Press, 1982
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