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Skew lines. (Bidroites.) (French)
Math. Péd., No. 165, 31-40 (2008).
Classification: G50 G40
1
Objective classification of quadrilaterals. (Classification objective des quadrilatères.) (French)
Math. Péd., No. 163, 5-35 (2007).
Classification: G50 G40 H40
2
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