@article{CMH_1974__49_139586,
     author = {Michel Andr\'e},
     title = {Alg\`ebres {Gradu\'ees} {Associ\'ees} et {Alg\`ebres} {Sym\'etriques} {Plates}},
     journal = {Commentarii mathematici Helvetici},
     pages = {277--301},
     publisher = {mathdoc},
     volume = {49},
     year = {1974},
     zbl = {0287.18020},
     url = {http://geodesic.mathdoc.fr/item/CMH_1974__49_139586/}
}