Schouten, J. A.  <br/><br/>
Pfaff's problem and its generalizations / 
J. A. Schouten and  W. v. d. Kulk 
 - Oxford :  At the Clarendon Press,  1949 
 - xvi, 542 p. ;  25 cm. 
<br/><br/>Includes bibliography and index 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Pfaffian problem.
<br/><br/><label>Dewey Class. No.: </label>516.36  / SCP 1949