@article{PIM_1963_N_S_03_17_a18,
     author = {Casimir Szymiczek},
     title = {L'\'Equation uv = w{\texttwosuperior} {En} {Nombres} {Triangulaires}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {139 },
     publisher = {mathdoc},
     volume = {_N_S_03},
     number = {17},
     year = {1963},
     url = {http://geodesic.mathdoc.fr/item/PIM_1963_N_S_03_17_a18/}
}