I
[Imm87] Neil Immerman. Languages That Capture Complexity Classes. SIAM Journal on Computing 16(4):760-778. Society for Industrial and Applied Math., August 1987. 
@article{siamcomp16(4)-Imm,
  author =              {Immerman, Neil},
  title =               {Languages That Capture Complexity Classes},
  publisher =           {Society for Industrial and Applied Math.},
  journal =             {SIAM Journal on Computing},
  volume =              {16},
  number =              {4},
  pages =               {760-778},
  year =                {1987},
  month =               aug,
}
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