Tractatus called afterwards Summule logicales / Peter of Spain (Petrus Hispanus Portugalensis) ; first critical edition from the manuscripts with an introduction by L. M. De Rijk .. - Iohannes PP. XXI, 1226-1277. (OLS)http://pul/name/13041; Rijk, Lambert Marie de, 1924- (OLS)http://pul/name/13042 (Van Gorcum, 1972)
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