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"The Boolean Hierarchy I: Structural Properties."
Jin-yi Cai et al. (1988)
- Jin-yi Cai, Thomas Gundermann, Juris Hartmanis, Lane A. Hemachandra, Vivian Sewelson, Klaus W. Wagner, Gerd Wechsung:
The Boolean Hierarchy I: Structural Properties. SIAM J. Comput. 17(6): 1232-1252 (1988)
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