Ockham and Ockhamists : acts of the symposium organized by the Dutch Society for Medieval Philosophy 'Medium Aevum' on the occasion of its 10th anniversary (Leiden, 10-12 September 1986) / ed. by E.P. Bos and H.A. KropJohn Buridan: a master of arts : some aspects of his philosophy : acts of the second symposium organized by the Dutch Society for Medieval Philosophy Medium Aevum on the occasion of its 15th anniversary, Leiden-Amsterdam (Vrije Universiteit), 20-21 June, 1991 / ed. by E.P. Bos and H.A. KropJohn Duns Scotus : renewal of philosophy : acts of the third symposium organized by the Dutch Society for Medieval Philosophy Medium Aevum (May 23 and 24, 1996) / ed. by E.P. BosOckham and Ockhamists : acts of the symposium organized by the Dutch Society for Medieval Philosophy 'Medium Aevum' on the occasion of its 10th anniversary (Leiden, 10-12 September 1986) / ed. by E.P. Bos and H.A. KropJohn Buridan: a master of arts : some aspects of his philosophy : acts of the second symposium organized by the Dutch Society for Medieval Philosophy Medium Aevum on the occasion of its 15th anniversary, Leiden-Amsterdam (Vrije Universiteit), 20-21 June, 1991 / ed. by E.P. Bos and H.A. Krop