By Robertson G.   Steger T.   in Journal of Combinatorial Theory, Series A

ISSN:0097-3165|103|1|91-104

Elsevier‎(2003)‎

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By Pensavalle C.   Steger T.   in Journal of Functional Analysis

ISSN:0022-1236|140|1|1-22

Academic Press‎(1996)‎

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