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  1. Exploiting the deep structure of constraint problems.Colin P. Williams & Tad Hogg - 1994 - Artificial Intelligence 70 (1-2):73-117.
  • Forward reasoning and dependency-directed backtracking in a system for computer-aided circuit analysis.Richard M. Stallman & Gerald J. Sussman - 1977 - Artificial Intelligence 9 (2):135-196.
  • Phase transitions in artificial intelligence systems.Bernardo A. Huberman & Tad Hogg - 1987 - Artificial Intelligence 33 (2):155-171.
  • The hardest constraint problems: A double phase transition.Tad Hogg & Colin P. Williams - 1994 - Artificial Intelligence 69 (1-2):359-377.
  • Easy problems are sometimes hard.Ian P. Gent & Toby Walsh - 1994 - Artificial Intelligence 70 (1-2):335-345.