VOLUME 2 1997 NUMBER 4

Wolf Göhring:
Minimal Initializing Word: A Contribution to Černý's Conjecture209–226
Jens Liebehenschel:
Ranking and Unranking of Lexicographically Ordered Words: An Average-Case Analysis227–268
Lucio De Prophetis, Stefano Varricchio:
Recognizability of Rectangular Pictures by Wang Systems269–288