Blakey, Joseph. <br/><br/>
University Mathematics 

 - 2 ed. 
 - London  English Language Book Society   1949 
 - P.581 
<br/><br/><label>Subjects--Topical Terms: </label> Conic Section  Expansion  Spherical  Co-Ordinate 
<br/><br/><label>Dewey Class. No.: </label>510.024 B60U