CCITT GAS 5-5 Economic Studies at the National Level in the Field of Telecommunications (1977-1980) :   5- Procedure for Establishing a Budget Model for a Telecommunication Undertaking /  

 - Geneva :   ITU,   1983. 
 - I, 25 s.:   il.;   30 cm. 
<br/><br/><label>ISBN: </label>9261016111