Feys, Robert,  1889- <br/><br/>
Modal logics / 
Edited with some complements by Joseph Dopp. 
 - Louvain :  E. Nauwelaerts,  1965. 
 - xiv, 219 p.  25 cm. 
 - Collection de logique math ematique.  Ser. B, 4 .
<br/><br/>Bibliogr.: p. [187]-215. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Modality (Logic)<br/>Logic, Symbolic and mathematical.