Trends in logic : 50 years of Studia logica / ed. by Vincent F. Hendricks and Jacek MalinowskiEssays in logic and ontology / ed. by Jacek Malinowski and Andrzej PietruszczakTowards mathematical philosophy : papers from the Studia Logica conference 'Trends in Logic IV' / David Makinson, Jacek Malinowski, Heinrich Wansing, ed.