J. Albert. On the Ehrenfeucht Conjecture on Test Sets and Its Dual Version. In Michal Chytil, Václav Koubek, editors, Mathematical Foundations of Computer Science 1984, Praha, Czechoslovakia, September 3-7, 1984, Proceedings. Volume 176 of Lecture Notes in Computer Science, pages 176-184, Springer, 1984.
Abstract is missing.