« La classe duale aux points doubles » d'une application
Compositio Mathematica, Volume 27 (1973) no. 2, p. 223-232 
@article{CM_1973__27_2_223_0,
     author = {Ronga, Felice},
     title = {\guillemotleft{} La classe duale aux points doubles \guillemotright{} d'une application},
     journal = {Compositio Mathematica},
     publisher = {Noordhoff International Publishing},
     volume = {27},
     number = {2},
     year = {1973},
     pages = {223-232},
     zbl = {0271.57009},
     mrnumber = {391114},
     language = {fr},
     url = {http://www.numdam.org/item/CM_1973__27_2_223_0}
}

Ronga, F. « La classe duale aux points doubles » d'une application. Compositio Mathematica, Volume 27 (1973) no. 2, pp. 223-232. http://www.numdam.org/item/CM_1973__27_2_223_0/

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