@article{1250181485,
author = {Min\'a\v c, J. and Spira, M.},
title = {$u = 4$ and quadratic extensions},
journal = {Rocky Mountain J. Math.},
volume = {19},
number = {4},
year = {1989},
pages = { 833-846},
language = {en},
url = {http://dml.mathdoc.fr/item/1250181485}
}
Mináč, J.; Spira, M. $u = 4$ and quadratic extensions. Rocky Mountain J. Math., Tome 19 (1989) no. 4, pp. 833-846. http://gdmltest.u-ga.fr/item/1250181485/