Discrete Applied Mathematics
Discrete Applied Mathematics > 1997 > 77 > 2 > 99-118
Discrete Applied Mathematics > 1997 > 79 > 1-3 > 119-125
Discrete Applied Mathematics > 1997 > 77 > 2 > 99-118
Discrete Applied Mathematics > 1997 > 79 > 1-3 > 119-125