%0 Journal Article
%A Yu. A. Drozd
%A V. V. Kirichenko
%A M. Ya. Komarnitskyj
%A L. A. Kurdachenko
%A V. V. Lyubashenko
%A V. V. Nekrashevych
%A B. V. Novikov
%A A. S. Oliynyk
%A A. P. Petravchuk
%A V. I. Sushchansky
%A V. M. Usenko
%T R.\,I.~Grigorchuk (his 50th birthday)
%J Algebra and discrete mathematics
%D 2003
%P E-F
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ADM_2003_4_a0/
%G en
%F ADM_2003_4_a0