Pshenichnyi B.N. <br/><br/>
Necessary Conditions For an Extremum 
/ by B.N.Pshenichnyi 
 - New York  Marcel Dekker Inc.  1971 
 - 230p. 
<br/><br/><label>ISBN: </label>082471556 
<br/><br/><label>Dewey Class. No.: </label>517.5  / PSH/N