Graf, Ulrich,  1908-1954. <br/><br/>
Kabarett der mathematik; 
zeichnungen von Maria-Erika Graf. 
 - 2. aufl. 
 - Dresden,  L. Ehlermann,  1943. 
 - 96 p.  illus., diagrs.  18 cm. 
<br/><br/>"Einige literatur" : p. 96. 
<br/><br/><label>LCCN: </label>af 47001451  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematical recreations.
<br/><br/><label>LC Class. No.: </label>QA95  / .G7