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Joris Hulstijn, 1997. Structured information states: raising and resolving issues.

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Gerhard Jaeger, 1996. Only updates: on the dynamics of the focus particle only.

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Balder ten Cate and Ken Shan, 2007. Axiomatizing Groenendijk's Logic of Interrogation.

In Questions in Dynamic Semantics, edited by Maria Aloni, Alastair Butler, and Paul Dekker.