Pillay, T K Manicavachagom Natarajan, T <br/><br/>
Text Book of Analytical Geometry 

 - Madras  S. Vishwanathan  1977 
 - p.456 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pairs of Straight Lines<br/>Circle<br/>Elipse
<br/><br/><label>Dewey Class. No.: </label>516 M278A