@article{M2AN_1970__4_2_29_0,
     author = {Lenormand, C. and Perrot, J. F.},
     title = {Note sur le th\'eor\`eme des demi-degr\'es},
     journal = {Revue fran\c{c}aise d'informatique et de recherche op\'erationnelle. S\'erie rouge},
     pages = {29--31},
     publisher = {Dunod},
     address = {Paris},
     volume = {4},
     number = {R2},
     year = {1970},
     mrnumber = {272679},
     zbl = {0206.26303},
     language = {fr},
     url = {http://archive.numdam.org/item/M2AN_1970__4_2_29_0/}
}