Śaṅkarānanda,  active 1290. <br/><br/>
Upaniṣadratnaṃ ātmapurāṇaṃ. 

 - [Trivandrum]  1963. 
 - xiv, xxiv, 559 p.  port.  28 cm. 
<br/><br/> In Malayalam. 
<br/><br/><label>LCCN: </label>sa 67003933  
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Upanishads--Criticism, interpretation, etc.
<br/><br/><label>LC Class. No.: </label>BL1120  / .S2