Sarafyan, Nubar. <br/><br/>
The Principle of Least Efforts & Evolution / 
N. Safaryan. 
 - First Edition 
 - Yerevan :  Printing House of NAS RA. 
 - 285 p. 
<br/><br/>Includes Bibliographical References 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Աստղագիտություն