@article{DGSh:213, author = {Denenberg, Larry and Gurevich, Yuri and Shelah, Saharon}, ams-subject = {(03G05)}, fromwhere = {1,1,IL}, journal = {Information and Control}, review = {MR 88b:03094}, pages = {216--240}, title = {{Definability by constant-depth polynomial-size circuits}}, volume = {70}, year = {1986}, }