1. Subjective response to road traffic noise;Griffiths;J. Sound Vib.,1968
2. The traffic noise index—a method of controlling noise nuisance;Langdon,1968
3. The concept of noise pollution level;Robinson,1969
4. An outline guide to criteria for the limitation of urban noise;Robinson,1969
5. Road traffic noise—its nuisance value;Bottom;Applied Acoustics,1969