@article{GDZPPN002233118,
title = {The intersection theorem for orderings of higher level in rings.},
journal = {Manuscripta mathematica},
volume = {76},
year = {1992},
pages = {273-278},
zbl = {0758.12003},
url = {http://dml.mathdoc.fr/item/GDZPPN002233118}
}
Berr, Ralph. The intersection theorem for orderings of higher level in rings.. Manuscripta mathematica, Tome 76 (1992) pp. 273-278. http://gdmltest.u-ga.fr/item/GDZPPN002233118/