On two-sided infinite fixed points of morphisms. Shallit, J. and Wang, M. Theor. Comput. Sci., 270(1-2):659–675, 2002.
Paper doi bibtex @article{DBLP:journals/tcs/ShallitW02,
author = {Jeffrey Shallit and
Ming{-}wei Wang},
title = {On two-sided infinite fixed points of morphisms},
journal = {Theor. Comput. Sci.},
volume = {270},
number = {1-2},
pages = {659--675},
year = {2002},
url = {https://doi.org/10.1016/S0304-3975(01)00092-5},
doi = {10.1016/S0304-3975(01)00092-5},
timestamp = {Sun, 28 May 2017 01:00:00 +0200},
biburl = {https://dblp.org/rec/bib/journals/tcs/ShallitW02},
bibsource = {dblp computer science bibliography, https://dblp.org}
}