International Telecommunication Union.
ITU-R recommendations 1994 TSM series : spectrum management techniques - International Telecommunication union ; 1994.
92610521614
Technology of industrial chemicals
621.396 I.T.U.
ITU-R recommendations 1994 TSM series : spectrum management techniques - International Telecommunication union ; 1994.
92610521614
Technology of industrial chemicals
621.396 I.T.U.