Gervacio, S. V. (1977). An extension of congruence [microform]. Photoduplication Service. University of the Philippines Library.
Citace podle Chicago (17th ed.)Gervacio, Severino V. An Extension of Congruence [microform]. Quezon City: Photoduplication Service. University of the Philippines Library, 1977.
Citace podle MLA (9th ed.)Gervacio, Severino V. An Extension of Congruence [microform]. Photoduplication Service. University of the Philippines Library, 1977.
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