Stefano Mazzanti. Bounded iteration and unary functions. Math. Log. Q., 51(1):89-94, 2005. [doi]
@article{Mazzanti05, title = {Bounded iteration and unary functions}, author = {Stefano Mazzanti}, year = {2005}, doi = {10.1002/malq.200410010}, url = {http://dx.doi.org/10.1002/malq.200410010}, researchr = {https://researchr.org/publication/Mazzanti05}, cites = {0}, citedby = {0}, journal = {Math. Log. Q.}, volume = {51}, number = {1}, pages = {89-94}, }