@article{GDZPPN002418282,
title = {Characterization of Fans and Hereditarily Pythagorean Fields.},
journal = {Mathematische Zeitschrift},
volume = {147},
year = {1976},
pages = {149-164},
zbl = {0319.12102},
url = {http://dml.mathdoc.fr/item/GDZPPN002418282}
}
Bröcker, Ludwig. Characterization of Fans and Hereditarily Pythagorean Fields.. Mathematische Zeitschrift, Tome 147 (1976) pp. 149-164. http://gdmltest.u-ga.fr/item/GDZPPN002418282/