The aim of this paper is to construct a graph G on n vertices which is a connected covering graph but has 2-degrees-(n) diagram orientations. This provides a negative answer to a question of I. Rival.
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Univ Nacl Gen Sarmiento, Inst Ciencias, Los Polvorines, Buenos Aires, ArgentinaUniv Nacl Gen Sarmiento, Inst Ciencias, Los Polvorines, Buenos Aires, Argentina
Gonzalez, Lucia M.
Grippo, Luciano N.
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Univ Nacl Gen Sarmiento, Inst Ciencias, Los Polvorines, Buenos Aires, Argentina
Consejo Nacl Invest Cient & Tecn, Buenos Aires, DF, ArgentinaUniv Nacl Gen Sarmiento, Inst Ciencias, Los Polvorines, Buenos Aires, Argentina
Grippo, Luciano N.
Safe, Martin D.
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UNS, Dept Matemat, Bahia Blanca, Buenos Aires, Argentina
UNS, CONICET, INMABB, Bahia Blanca, Buenos Aires, Argentina
Consejo Nacl Invest Cient & Tecn, Buenos Aires, DF, ArgentinaUniv Nacl Gen Sarmiento, Inst Ciencias, Los Polvorines, Buenos Aires, Argentina
Safe, Martin D.
dos Santos, Vinicius F.
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Univ Fed Minas Gerais, Dept Ciencia Comp, Belo Horizonte, MG, BrazilUniv Nacl Gen Sarmiento, Inst Ciencias, Los Polvorines, Buenos Aires, Argentina