Denis Huisman, Dictionnaire des Philosophes, Paris, Presses Universitaires de France, First Edition, 1984. Jean-François Mattéi, Encyclopédie philosophique universelle, tome III, Les Oeuvres philosophiques, Dictionnaire, Paris, Presses Universitaires de France, 1992. Dov Gabbay and John Woods, International Directory of Logicians'', Amsterdam, Elsevier. Notes References 1932 births Belgian logicians Academic staff of the University of Liège 20th-century Belgian philosophers Harvard University alumni Alumni of University College London Stanford University people University of California, Berkeley people 2011 deaths Analytic philosophers