1
by Jansen, Klaus
Published 2000
Springer-Verlag Berlin Heidelberg

2
by Luby, Michael
Published 1998
Springer-Verlag Berlin Heidelberg

3
by Herik, H Jaap
Published 1999
Springer-Verlag Berlin Heidelberg

4
by Cornuéjols, Gérard
Published 1999
Springer-Verlag Berlin Heidelberg