The following publications are possibly variants of this publication:
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- Level Two of the Quantifier Alternation Hierarchy Over Infinite WordsManfred Kufleitner, Tobias Walter. mst, 62(3):467-480, 2018. [doi]
- The Half-Levels of the FO2 Alternation HierarchyLukas Fleischer, Manfred Kufleitner, Alexander Lauser. mst, 61(2):352-370, 2017. [doi]
- 2 Alternation for Automata over Finite and Infinite WordsViktor Henriksson, Manfred Kufleitner. dlt 2021: 180-191 [doi]
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