Ralf Lämmel, Vadim Zaytsev. An Introduction to Grammar Convergence. In Michael Leuschel, Heike Wehrheim, editors, Integrated Formal Methods, 7th International Conference, IFM 2009, Düsseldorf, Germany, February 16-19, 2009. Proceedings. Volume 5423 of Lecture Notes in Computer Science, pages 246-260, Springer, 2009. [doi]