TY  - JOUR
AU  - Volenec, Vladimir
TI  - Subtractive groupoids and laterally commutative heaps
JO  - Portugaliae mathematica
PY  - 1990
SP  - 43
EP  - 45
VL  - 47
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1990__47_1_115699/
LA  - en
ID  - PORMA_1990__47_1_115699
ER  -