Smarandache, Florentin, author
Hexis, 2005
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Sulistomo Adie Suwarno, author
Universitas Indonesia, 2005
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Ummu Maemunah, author
Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2006
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Schagrin, Morton L., author
Random House , 1968
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Manna, Zohar, author
Society for Industrial and Applied Mathematics, 1980
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