TY  - JOUR
AU  - Konstantin S. Efimov
AU  - Alexander A. Makhnev
TI  - Distance-regular graph with intersection array $\{27, 20, 7; 1, 4, 21\}$ does not exist
JO  - Ural mathematical journal
PY  - 2020
SP  - 63
EP  - 67
VL  - 6
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/UMJ_2020_6_2_a5/
LA  - en
ID  - UMJ_2020_6_2_a5
ER  -