%0 Journal Article
%A Konstantin S. Efimov
%A Alexander A. Makhnev
%T Distance-regular graph with intersection array $\{27, 20, 7; 1, 4, 21\}$ does not exist
%J Ural mathematical journal
%D 2020
%P 63-67
%V 6
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/UMJ_2020_6_2_a5/
%G en
%F UMJ_2020_6_2_a5