Discrete Mathematics
Discrete Mathematics > 2009 > 309 > 6 > 1417-1421
Discrete Mathematics > 2009 > 309 > 6 > 1788-1792
Discrete Mathematics > 2009 > 309 > 11 > 3653-3658
Discrete Mathematics > 2009 > 309 > 13 > 4241-4246
Discrete Mathematics > 2009 > 309 > 13 > 4469-4474
Discrete Mathematics > 2009 > 309 > 17 > 5432-5436