Dear users, 

We are very SORRY that there is something wrong with our tool for computing the lower bounds (LB). 
Many thanks for Batoul Mahvash's message (from Concordia University, Canada). 

Sorry for any inconvenience caused. Now we upload the source code (LB.cpp) to the website and hope it helps. 
We are still fixing bugs. 


PS: ALL the theoretical statements and proofs are correct for sure in our paper published in EJOR, 2013. 



Sincerely, 
Chia-Hong Hsu, Yin-Ru Wang and Chung-Shou Liao

March 2013
