TY  - JOUR
AU  - A. A. Vinogradov
TI  - Nonaxiomatizability of directionally ordered groups in the class of nontrivially partially ordered groups
JO  - Matematičeskie zametki
PY  - 1973
SP  - 395
EP  - 397
VL  - 14
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1973_14_3_a9/
LA  - ru
ID  - MZM_1973_14_3_a9
ER  -