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Cooper, David E., author
Clarendon Press , 2006
Buku Teks
Margaretha Betsy Rautoy, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 1990
UI - Skripsi (Membership)
Sumeru Ashari, author
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Chan, Peter, author
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Buku Teks