@article{MM2_1989__65_3_155426,
     author = {Eberhard Becker and Danielle Gondard},
     title = {On {Rings} admitting orderings and 2-primary chains of orderings of higher level.},
     journal = {Manuscripta mathematica},
     pages = {63--82},
     publisher = {mathdoc},
     volume = {65},
     number = {3},
     year = {1989},
     zbl = {0689.12016},
     url = {http://geodesic.mathdoc.fr/item/MM2_1989__65_3_155426/}
}