TY  - JOUR
AU  - S. MacLane
TI  - An algebra of additive relations
JO  - Matematika
PY  - 1963
SP  - 3
EP  - 12
VL  - 7
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAT_1963_7_6_a0/
LA  - ru
ID  - MAT_1963_7_6_a0
ER  -