@article{NAM_1911_4_11__97_0,
     author = {Willigens},
     title = {Sur les polyn\^omes $U_{m,n} = \frac{1}{2^{m+n} m!n!} \frac{\partial ^{m+n}(x^2+y^2-1)^{m+n}}{\partial x^m \partial y^n}$},
     journal = {Nouvelles annales de math\'ematiques : journal des candidats aux \'ecoles polytechnique et normale},
     pages = {97--116},
     publisher = {Carilian-Goeury et Vor Dalmont},
     volume = {4e s{\'e}rie, 11},
     year = {1911},
     language = {fr},
     url = {http://www.numdam.org/item/NAM_1911_4_11__97_0/}
}