Feys, Robert <br/><br/>
Modal logics 
Edited with some complements by Joseph Dopp. 
 - Paris  Gauthier-Villars  1965. 
 - 215 p. 
<br/><br/>Bibliography : p. [187]-215. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Modality Logic<br/>Logic, Symbolic and mathematical