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Discrete Mathematics > 2013 > 313 > 23 > 2792-2797
Journal of Algebraic Combinatorics > 2012 > 36 > 2 > 309-332
The Ramanujan Journal > 2010 > 23 > 1-3 > 127-135
Discrete Mathematics > 2009 > 309 > 20 > 6070-6073
Discrete Mathematics > 2013 > 313 > 23 > 2792-2797
Journal of Algebraic Combinatorics > 2012 > 36 > 2 > 309-332
The Ramanujan Journal > 2010 > 23 > 1-3 > 127-135
Discrete Mathematics > 2009 > 309 > 20 > 6070-6073