By Hemmeter J.   Woldar A.   in European Journal of Combinatorics

ISSN:0195-6698|20|1|81-85

Elsevier‎(1999)‎

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By Soules P.C.   Woldar A.J.   in Journal of Algebra

ISSN:0021-8693|185|1|258-265

Academic Press‎(1996)‎

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By Hemmeter J.   Ustimenko V.J.   Woldar A.J.   in European Journal of Combinatorics

ISSN:0195-6698|19|4|487-498

Elsevier‎(1998)‎

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