Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
Henning Bordihn, Markus Holzer, Martin Kutrib. Unsolvability levels of operation problems for subclasses of context-free languages. Int. J. Found. Comput. Sci., 16(3):423-440, 2005. [doi]
Abstract is missing.