TY  - JOUR
AU  - Loonstra, F.
TI  - The classes of partially ordered groups
JO  - Compositio Mathematica
PY  - 1951
SP  - 130
EP  - 140
VL  - 9
PB  - Kraus Reprint
UR  - http://www.numdam.org/item/CM_1951__9__130_0/
LA  - en
ID  - CM_1951__9__130_0
ER  -