By Hummel P.   in Journal of Number Theory

ISSN:0022-314X|103|2|257-266

Elsevier‎(2003)‎

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By Hummel P.   THÖMKE V.   OLdenBÜRGER H.A.   Specht F.   in Journal of Adolescence

ISSN:0140-1971|23|3|305-317

Academic Press‎(2000)‎

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