Lubelski, S., & Walfisz, A. (1972). Acta arithmetica.
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Dyfyniad Arddull Chicago
Lubelski, S., and A. Walfisz. Acta Arithmetica. Warszawa, 1972.
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Dyfyniad MLA
Lubelski, S., and A. Walfisz. Acta Arithmetica. 1972.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.