@article{JTNB_2000__12_1_87_0,
     author = {Cilleruelo, Javier and Jim\'enez-Urroz, Jorge},
     title = {The hyperbola $xy = N$},
     journal = {Journal de th\'eorie des nombres de Bordeaux},
     pages = {87--92},
     publisher = {Universit\'e Bordeaux I},
     volume = {12},
     number = {1},
     year = {2000},
     mrnumber = {1827840},
     zbl = {1006.11055},
     language = {en},
     url = {http://www.numdam.org/item/JTNB_2000__12_1_87_0/}
}