I
[Imm81] Neil Immerman. Number of quantifiers is better than number of tape cells. Journal of Computer and System Sciences 22(3):384-406. Academic Press, June 1981. 
@article{jcss22(3)-Imm,
  author =              {Immerman, Neil},
  title =               {Number of quantifiers is better than number of tape
                         cells},
  publisher =           {Academic Press},
  journal =             {Journal of Computer and System Sciences},
  volume =              {22},
  number =              {3},
  pages =               {384-406},
  year =                {1981},
  month =               jun,
  doi =                 {10.1016/0022-0000(81)90039-8},
}
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