Media type: E-Article Title: Handbook of Modal Logic: 6 Algebras and coalgebras Contributor: Venema, Yde imprint: Elsevier, 2007 Published in: Handbook of Modal Logic Language: Not determined DOI: 10.1016/s1570-2464(07)80009-7 ISSN: 1570-2464 Origination: Footnote: