@article{MZ_1981__176_183665,
     author = {Thomas C. Craven},
     title = {Orderings of {Higher} {Level} and {Semilocal} {Rings.}},
     journal = {Mathematische Zeitschrift},
     pages = {577--588},
     year = {1981},
     volume = {176},
     zbl = {0438.13022},
     url = {http://geodesic.mathdoc.fr/item/MZ_1981__176_183665/}
}