Hypo-matchings in directed graphs

@inproceedings{Pap2005HypomatchingsID,
  title={Hypo-matchings in directed graphs},
  author={Gyula Pap},
  year={2005}
}
We give a common generalization of results on hypo-matchings given in a sequence of papers by G. Cornuéjols, D. Hartvigsen and W. Pulleyblank in [2, 3, 4, 5] and results on even factors given by W.H. Cunningham and J.F. Geelen in [7] and by the author and L. Szegő in [13].