@article{ASENS_1947_3_64__227_0,
     author = {Decuyper, Marcel},
     title = {Sur l'hypocyclo\"\i de \`a trois rebroussements},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     publisher = {Elsevier},
     volume = {3e s{\'e}rie, 64},
     year = {1947},
     pages = {227-246},
     doi = {10.24033/asens.949},
     zbl = {0030.31701},
     mrnumber = {10,57f},
     language = {fr},
     url = {http://www.numdam.org/item/ASENS_1947_3_64__227_0}
}

Decuyper, Marcel. Sur l'hypocycloïde à trois rebroussements. Annales scientifiques de l'École Normale Supérieure, Serie 3, Volume 64 (1947) pp. 227-246. doi : 10.24033/asens.949. http://www.numdam.org/item/ASENS_1947_3_64__227_0/