Venema, Yde. <br/><br/>
Many-dimensional modal logic / 
by Yde Venema. 
 - Amsterdam, Neth. :  Universiteit van Amsterdam,  1989. 
 - 177 p. 
<br/><br/> Includes bibliographical references and index.  Contents : Dimensions in modal logic--The square universe. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Modality (Logic).<br/>Modal analysis.<br/>Algebra.