Boltianskii, V. G. <br/><br/>
Envelopes / 
by V.G. Boltyanskii ; translated and adapted from the Russian by Robert B. Brown. 
 - New York :  Pergamon Press,  1964. 
 - ix, 76 p. : 
<br/><br/> "A Pergamon Press book." 
<br/><br/><label>ISBN: </label>2028 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Envelopes (Geometry)
<br/><br/><label>Dewey Class. No.: </label>516  / En