Hideyuki Takahashi. Undecidable Questions about the Maximum Invariant Set. Inf. Comput., 33(1):1-34, January 1977.
@article{Takahashi77a, title = {Undecidable Questions about the Maximum Invariant Set}, author = {Hideyuki Takahashi}, year = {1977}, month = {January}, researchr = {https://researchr.org/publication/Takahashi77a}, cites = {0}, citedby = {0}, journal = {Inf. Comput.}, volume = {33}, number = {1}, pages = {1-34}, }