@article{VMUMM_1989_4_a14,
     author = {I. D. Chipchakov},
     title = {Extension of field valuations onto algebraic skew fields},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {61--63},
     year = {1989},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1989_4_a14/}
}