Martin Lange. The alternation hierarchy in fixpoint logic with chop is strict too. Inf. Comput., 204(9):1346-1367, 2006. [doi]
@article{Lange06:1,
title = {The alternation hierarchy in fixpoint logic with chop is strict too},
author = {Martin Lange},
year = {2006},
doi = {10.1016/j.ic.2006.05.001},
url = {http://dx.doi.org/10.1016/j.ic.2006.05.001},
tags = {logic},
researchr = {https://researchr.org/publication/Lange06%3A1},
cites = {0},
citedby = {0},
journal = {Inf. Comput.},
volume = {204},
number = {9},
pages = {1346-1367},
}