Discrete Mathematics
Discrete Mathematics > 2009 > 309 > 8 > 2166-2173
Discrete Mathematics > 2009 > 309 > 12 > 3985-3991
Discrete Mathematics > 2009 > 309 > 13 > 4299-4305
Discrete Mathematics > 2009 > 309 > 18 > 5636-5649
Discrete Mathematics > 2009 > 309 > 18 > 5789-5798