Krieger (2006) p.281 Krieger, Dalia (2006). "On critical exponents in fixed points of non-erasing morphisms". In Ibarra, Oscar H.; Dang, Zhe (eds.). Developments in Language Theory: Proceedings 10th International Conference, DLT 2006, Santa Barbara, CA, USA, June 26–29, 2006. Lecture Notes in Computer Science. Vol. 4036. Springer-Verlag. pp. 280–291. ISBN3-540-35428-X. Zbl1227.68074.
Krieger (2006) p.280 Krieger, Dalia (2006). "On critical exponents in fixed points of non-erasing morphisms". In Ibarra, Oscar H.; Dang, Zhe (eds.). Developments in Language Theory: Proceedings 10th International Conference, DLT 2006, Santa Barbara, CA, USA, June 26–29, 2006. Lecture Notes in Computer Science. Vol. 4036. Springer-Verlag. pp. 280–291. ISBN3-540-35428-X. Zbl1227.68074.
Krieger (2006) p.282 Krieger, Dalia (2006). "On critical exponents in fixed points of non-erasing morphisms". In Ibarra, Oscar H.; Dang, Zhe (eds.). Developments in Language Theory: Proceedings 10th International Conference, DLT 2006, Santa Barbara, CA, USA, June 26–29, 2006. Lecture Notes in Computer Science. Vol. 4036. Springer-Verlag. pp. 280–291. ISBN3-540-35428-X. Zbl1227.68074.