Discrete Applied Mathematics
Discrete Applied Mathematics > 2013 > 161 > 3 > 330-335
Discrete Applied Mathematics > 2013 > 161 > 16-17 > 2647-2652
Discrete Applied Mathematics > 2013 > 161 > 16-17 > 2758-2763
Discrete Applied Mathematics > 2013 > 161 > 18 > 3097-3099