Digital Radio Mondiale (DRM) - System Specification for digital transmissions in the broadcasting bands below 30 MHz IEC/PAS 62272-1 /  
 IEC/PAS 62272-1 
ISO, IEC. 
 - Edition 1.0. 
 - Geneva :   ISO :   IEC,   1900. 
 - 158 stron ;   30 cm.