Representations of semisimple Lie algebras in the BGG category O / 
Humphreys, James E. 
 - Providence, R.I. :  American Mathematical Society,  2008 
 - xvi, 289 p. :  ill. ;  27 cm. 
 - Graduate studies in mathematics ;  v. 94 .
<br/><br/><label>ISBN: </label>9780821846780 (alk. paper) | 0821846787 (alk. paper)