Delaney, C.F.G.
Ellis Horwood, 1980"
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Morawetz, Cathleen S.
Society for Industrial and Applied Mathematics, 1975
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Society for Industrial and Applied Mathematics, 1982
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Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2013
UI - Skripsi (Membership)
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Fakultas Teknik Universitas Indonesia, 2010
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