@article{ELMA_1965__20_140807,
     author = {W. Sierpinski},
     title = {Sur trois nombres triangulaires en progression arithm\'etique \`a diff\'erence trinagulaire.},
     journal = {Elemente der Mathematik},
     pages = {79--81},
     publisher = {mathdoc},
     volume = {20},
     year = {1965},
     zbl = {0131.28303},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1965__20_140807/}
}