@article{JMPA_1947_9_26__283_0,
     author = {Trjitzinsky, W. J.},
     title = {Singular integral equations of the first kind and those related to permutability and iteration},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {283--351},
     volume = {Ser. 9, 26},
     year = {1947},
     mrnumber = {25067},
     language = {en},
     url = {http://www.numdam.org/item/JMPA_1947_9_26__283_0/}
}