Philippe Balbiani, Ilya Shapirovsky, Valentin B. Shehtman. Every world can see a Sahlqvist world. In Guido Governatori, Ian M. Hodkinson, Yde Venema, editors, Advances in Modal Logic 6, papers from the sixth conference on Advances in Modal Logic, held in Noosa, Queensland, Australia, on 25-28 September 2006. pages 69-85, College Publications, 2006. [doi]
Abstract is missing.