TY  - JOUR
AU  - Z. I. Kozlova
TI  - Certain $\Delta\Sigma$-operations whose bases are obtained by uniting the chains of the base of the original operation
JO  - Doklady Akademii Nauk
PY  - 1969
SP  - 1001
EP  - 1003
VL  - 188
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1969_188_5_a9/
LA  - ru
ID  - DAN_1969_188_5_a9
ER  -