Emilio Spedicato, Giorgio Tagliabue. Attempt to Solve a Combinatorial Problem in the Continuum by a Method of Extension-Reduction. In R. Conti, Antonio Ruberti, editors, 5th Conference on Optimization Techniques, Part 1, Rome, Italy, May 7-11, 1973. Volume 3 of Lecture Notes in Computer Science, pages 554-565, Springer, 1973.
Abstract is missing.