Perelman , Y  <br/><br/>
ගණිත විනෝදය  : 

 - Pragathi :   Colombo ;  2014. 
 - 197 p; 21 cm .  01 
 - 2025-02-18 
<br/><br/><label>ISBN: </label>9789551319359 
<br/><br/><label>Nat. Bib. No.: </label>0006290 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>PER 
<br/><br/><label>Universal Decimal Class. No.: </label>510