//-->
A branch-and-bound algorithm for the multilevel uncapacitated facility location problem
Tcha, Dong-wan, (1984)
B: OPTIMAL ALLOCATION - Design of communication networks with survivability constraints Bb:220
Myung, Young-Soo, (1999)
Optimal Load Balancing on SONET Bidirectional Rings
Myung, Young-Soo, (1997)