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Balbiani, P. and Kikot, Stanislav (2012) Sahlqvist theorems for precontact logics. In: Bolander, T. and Braner, T. and Ghilardi, S. and Moss, L.S. (eds.) Advances in Modal Logic. London, UK: College Publications, pp. 55-70. ISBN 9781848900684.
Artale, A. and Kontchakov, Roman and Ryzhikov, Vladislav and Zakharyaschev, Michael (2009) DL-Lite with temporalised concepts, rigid axioms and roles. In: Ghilardi, S. and Sebastiani, R. (eds.) Frontiers of Combining Systems. Lecture Notes in Computer Science 5749. Berlin, Germany: Springer, pp. 133-148. ISBN 9783642042218.
Ghilardi, S. and Lutz, C. and Wolter, F. and Zakharyaschev, Michael (2006) Conservative extensions in modal logic. In: Governatori, G. and Hodkinson, I.M. and Venema, Y. (eds.) Advances in Modal Logic 6. College Publications, pp. 187-207. ISBN 9781904987208.