@article{ASNSP_1990_4_17_4_505_0, author = {Berry, T. G.}, title = {Points at rational distance from the corners of a unit square}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {505--529}, publisher = {Scuola normale superiore}, volume = {Ser. 4, 17}, number = {4}, year = {1990}, zbl = {0726.11041}, mrnumber = {1093707}, language = {en}, url = {http://www.numdam.org/item/ASNSP_1990_4_17_4_505_0/} }