Michael Domaratzki, Jeffrey Shallit, Sheng Yu. Minimal Covers of Formal Languages. In Werner Kuich, Grzegorz Rozenberg, Arto Salomaa, editors, Developments in Language Theory, 5th International Conference, DLT 2001, Vienna, Austria, July 16-21, 2001, Revised Papers. Volume 2295 of Lecture Notes in Computer Science, pages 319-329, Springer, 2001. [doi]
Abstract is missing.