@article{CRMATH_2004__338_12_909_0,
     author = {Bruno Vallette},
     title = {Koszul duality for {PROPs}},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {909--914},
     publisher = {Elsevier},
     volume = {338},
     number = {12},
     year = {2004},
     doi = {10.1016/j.crma.2004.04.004},
     language = {en},
}