@article{JMPA_1921_8_4__327_0,
     author = {Hancock, Harris},
     title = {Integral solutions of the equation $\xi^2+\eta^2=\zeta^2$ in the quadratic realms of rationality},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {327--341},
     publisher = {Gauthier-Villars},
     volume = {Ser. 8, 4},
     year = {1921},
     language = {en},
     url = {http://www.numdam.org/item/JMPA_1921_8_4__327_0/}
}