English logic and semantics from the end of the twelfth century to the time of Ockham and Burleigh : acts of the 4th European symposium on mediaeval logic and semantics, Leiden-Nijmegen, 23-27 april 1979 / edited by H. A. G. Braakhuis, C. H. Kneepkens, L. M. de Rijk. - Nijmegen : Ingenium publishers, 1981. - 471 p. ; 24 cm.