CCIR Plenary Assembly Duesseldorf, 1990 :   Recommendations : Fixed Service Using Radio-Relay Systems /   Vol.9 Part1+Annex 

 - Geneva :   ITU,   1990. 
 - XXVI, 139 s.+Annex;   30 cm. 
<br/><br/><label>ISBN: </label>9261042511