Mathimatiki Egkiklopedia (epitomos) Arithmitiki-Algevra-Geometria-Trigonometria Ypo Morfin Lexikou dia tous mathitas apo A' mechri ST΄ Gimnasiou ipopsifious anotaton scholon, fititas k.l.p.[1969]
Petros D. PloutsisLanguage:
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