Stefano Mazzanti. Iteration on notation and unary functions. Math. Log. Q., 59(6):415-434, 2013. [doi]
@article{Mazzanti13, title = {Iteration on notation and unary functions}, author = {Stefano Mazzanti}, year = {2013}, doi = {10.1002/malq.201200055}, url = {http://dx.doi.org/10.1002/malq.201200055}, researchr = {https://researchr.org/publication/Mazzanti13}, cites = {0}, citedby = {0}, journal = {Math. Log. Q.}, volume = {59}, number = {6}, pages = {415-434}, }