TY  - JOUR
AU  - N. S. Romanovskii
TI  - Finite approximabiliyt of free products with respect to occurrence
JO  - Izvestiya. Mathematics 
PY  - 1969
SP  - 1245
EP  - 1249
VL  - 3
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1969_3_6_a4/
LA  - en
ID  - IM2_1969_3_6_a4
ER  -