Maximum weight cycle packing in directed graphs, with application to kidney exchange programs

Biro, Péter, David F. Manlove, and Romeo Rizzi. "Maximum weight cycle packing in directed graphs, with application to kidney exchange programs." Discrete Mathematics, Algorithms and Applications 1.04 (2009): 499-517. DOI: http://dx.doi.org/10.1142/S1793830909000373