Ronald V. Book, Matthias Jantzen, and Celia Wrathall.
Monadic Thue systems.
Theoretical Computer Science, 19:231-251, 1982.
@Article{Jantzen+82c, AUTHOR = {Book, Ronald V. and Jantzen, Matthias and Wrathall, Celia}, PAGES = {231--251}, JOURNAL = {Theoretical Computer Science}, VOLUME = 19, TITLE = {Monadic {Thue} systems}, YEAR = 1982, ISSN = {} }