| B. Guenin and R. Thomas, Packing Directed Circuits Exactly, manuscript. |
....with the min max relation on feedback sets and cycle packings in both weighted and unweighted cases are characterized in our two papers. The closely related problems of describing digraphs with the same min max properties have also attracted much attention, see, for instances, Guenin and Thomas [4], Lucchesi and Younger [6, 5] Seymour [7] and Cai, Deng and Zang [1] However, the general problems remain open, and certainly they deserve more research efforts. ....
B. Guenin and R. Thomas, Packing Directed Circuits Exactly, manuscript.
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