Kangbok Lee Joseph Y.-T. Leung Michael Pinedo A note on "An approximation algorithm for the load-balanced semi-matching problem in weighted bipartite graphs". 608-610 2009 109 Inf. Process. Lett. 12 http://dx.doi.org/10.1016/j.ipl.2009.02.010 db/journals/ipl/ipl109.html#LeeLP09