@InProceedings{weis_et_al:DagSemProc.06451.6,
  author =	{Weis, Philipp and Immerman, Neil},
  title =	{{Structure Theorem and Strict Alternation Hierarchy for FO\~{A}‚\^{A}² on Words}},
  booktitle =	{Circuits, Logic, and Games},
  pages =	{1--22},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2007},
  volume =	{6451},
  editor =	{Thomas Schwentick and Denis Th\'{e}rien and Heribert Vollmer},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.06451.6},
  URN =		{urn:nbn:de:0030-drops-9751},
  doi =		{10.4230/DagSemProc.06451.6},
  annote =	{Keywords: Descriptive complexity, finite model theory, alternation hierarchy, Ehrenfeucht-Fraisse games}
}