संदर्भ सूचना-पुस्तिका

m  /O 


  

 , G   m
( ) 

 .
G 
  



  20
 

 ,   
    .
   1 

 3
   2 .
A   



  
  



  ,     O
 .  

   ;  
 O  

 .
221
U