@article{GDZPPN002353776,
title = {The Pythagorean closure of fields.},
journal = {Mathematica Scandinavica},
volume = {38},
year = {1976},
pages = {177-191},
zbl = {0339.12101},
url = {http://dml.mathdoc.fr/item/GDZPPN002353776}
}
Griffin, Malcolm P. The Pythagorean closure of fields.. Mathematica Scandinavica, Tome 38 (1976) pp. 177-191. http://gdmltest.u-ga.fr/item/GDZPPN002353776/