@inproceedings{DasMitPau_j1998, author = {J{\"u}rgen~Dassow and Victor~Mitrana and Gheorghe~P\u{a}un}, title = {Point mutations in context-free languages}, booktitle = {Proc. 3rd Internat. Conf. Developments in Language Theory}, publisher = {Aristotle University of Thessaloniki}, year = 1998, editor = {Symeon~Bozapalidis}, pages = {429--446} }