@article{ADM_2003_4_a0,
     author = {Yu. A. Drozd and V. V. Kirichenko and M. Ya. Komarnitskyj and L. A. Kurdachenko and V. V. Lyubashenko and V. V. Nekrashevych and B. V. Novikov and A. S. Oliynyk and A. P. Petravchuk and V. I. Sushchansky and V. M. Usenko},
     title = {R.\,I.~Grigorchuk (his 50th birthday)},
     journal = {Algebra and discrete mathematics},
     pages = {E--F},
     publisher = {mathdoc},
     number = {4},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2003_4_a0/}
}