Kreiling, G. (1975). Untersuchungen zum Tetrahedran-Problem.
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Tohutoru Kātū Chicago (17th ed.)
Kreiling, Gerda. Untersuchungen Zum Tetrahedran-Problem. Marburg, 1975.
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Tohutoro MLA (9th ed.)
Kreiling, Gerda. Untersuchungen Zum Tetrahedran-Problem. 1975.
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Kua rahua te tārua ki te papatopenga
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