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Advances in GeometryVol. 2, No. 1, pp. 1–12 (2002)  | 
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Perp-systems and partial geometriesFrank De Clerck, Mario Delanote, Nicholas Hamilton and Rudolf MathonFull text of the article: (for faster download, first choose a mirror) 
 Electronic fulltext finalized on: 4 Dec 2001. This page was last modified: 17 Jun 2005. 
© 2001 Walter de Gruyter GmbH & Co. KG
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