Sommerville, Duncan M’Laren Young,   1879-1934 <br/><br/>
Analytical conics / 
D. M. Y. Sommerville. 
 - London :  G. Bell and Sons,   1946. 
 - vii, 310 p. :  ill. ;  21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Conic sections
<br/><br/><label>LC Class. No.: </label>SPE-B 0035