Arthur W. Apter. An Easton theorem for level by level equivalence. Math. Log. Q., 51(3):247-253, 2005. [doi]
@article{Apter05a, title = {An Easton theorem for level by level equivalence}, author = {Arthur W. Apter}, year = {2005}, doi = {10.1002/malq.200510023}, url = {http://dx.doi.org/10.1002/malq.200510023}, researchr = {https://researchr.org/publication/Apter05a}, cites = {0}, citedby = {0}, journal = {Math. Log. Q.}, volume = {51}, number = {3}, pages = {247-253}, }