@article{AL_1993_32_2_a7,
     author = {Yu. L. Ershov},
     title = {Letter to the editors: {``Forcing} in admissible sets''               {[Algebra} and {Logic} {\bf 29} (1990), no.~6, 424--430;   {MR1159138]}},
     journal = {Algebra i logika},
     pages = {222--223},
     publisher = {mathdoc},
     volume = {32},
     number = {2},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1993_32_2_a7/}
}