Media type: E-Article Title: Unification, finite duality and projectivity in varieties of Heyting algebras Contributor: Ghilardi, Silvio Published: Elsevier BV, 2004 Published in: Annals of Pure and Applied Logic, 127 (2004) 1-3, Seite 99-115 Language: English DOI: 10.1016/j.apal.2003.11.010 ISSN: 0168-0072 Origination: Footnote: Access State: Open Access