Points at rational distance from the corners of a unit square
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 17 (1990) no. 4, pp. 505-529. 
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     title = {Points at rational distance from the corners of a unit square},
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Berry, T. G. Points at rational distance from the corners of a unit square. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 17 (1990) no. 4, pp. 505-529. http://archive.numdam.org/item/ASNSP_1990_4_17_4_505_0/

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