Discrete Mathematics
Discrete Mathematics > 1998 > 187 > 1-3 > 137-149
Discrete Mathematics > 1998 > 190 > 1-3 > 223-226
Discrete Mathematics > 2013 > 313 > 4 > 517-539
Discrete Mathematics > 1998 > 187 > 1-3 > 137-149
Discrete Mathematics > 1998 > 190 > 1-3 > 223-226
Discrete Mathematics > 2013 > 313 > 4 > 517-539