@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},
     mrnumber = {1093707},
     zbl = {0726.11041},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1990_4_17_4_505_0/}
}