J. G. W. Bentley, Peter G. Bishop, Meine van der Meulen. An Empirical Exploration of the Difficulty Function. In Maritta Heisel, Peter Liggesmeyer, Stefan Wittmann, editors, Computer Safety, Reliability, and Security, 23rd International Conference, SAFECOMP 2004, Potsdam, Germany, September 21-24, 2004, Proceedings. Volume 3219 of Lecture Notes in Computer Science, pages 60-71, Springer, 2004. [doi]
Abstract is missing.