Steven S. Muchnick. The Vectorized Grzegorczyk Hierarchy. Math. Log. Q., 22(1):441-480, 1976. [doi]
@article{Muchnick76-0, title = {The Vectorized Grzegorczyk Hierarchy}, author = {Steven S. Muchnick}, year = {1976}, doi = {10.1002/malq.19760220156}, url = {http://dx.doi.org/10.1002/malq.19760220156}, researchr = {https://researchr.org/publication/Muchnick76-0}, cites = {0}, citedby = {0}, journal = {Math. Log. Q.}, volume = {22}, number = {1}, pages = {441-480}, }