Magnus Steinby. Tree Language Problems in Pattern Recognition Theory (Extended Abstract). In János Csirik, János Demetrovics, Ferenc Gécseg, editors, Fundamentals of Computation Theory, International Conference FCT 89, Szeged, Hungary, August 21-25, 1989, Proceedings. Volume 380 of Lecture Notes in Computer Science, pages 444-450, Springer, 1989.
Abstract is missing.