Poskitt, Kjartan <br/><br/>
The Phantom X  
Kjartan Poskitt ; illustrated by Philip Reeve. 
 - London   Scholastic  2009 
 - 160 pages   illustrations  20 cm 
 - Murderous maths .
<br/><br/><label>ISBN: </label>9781407107134 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Algebra--Humor--Juvenile literature.<br/>Mathematics--Juvenile humor.<br/>Mathematics--Miscellanea--Juvenile literature.<br/>Mathematical recreations.