By Adin R.M.   Roichman Y.   in European Journal of Combinatorics

ISSN:0195-6698|22|4|431-446

Elsevier‎(2001)‎

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By Adin R.M.   Athanasiadis C.A.   in Journal of Combinatorial Theory, Series A

ISSN:0097-3165|73|2|360-367

Academic Press‎(1996)‎

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