@article{JMPA_1947_9_26__1_0,
     author = {Petiau, G\'erard},
     title = {Sur les relations tensorielles entre densit\'es de valeurs moyennes en th\'eorie de l{\textquoteright}\'electron de {Dirac.} {II.} {Relations} diff\'erentielles},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {1--14},
     volume = {9e s{\'e}rie, 26},
     year = {1947},
     zbl = {0034.13203},
     mrnumber = {24855},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1947_9_26__1_0/}
}