TY JOUR TI Acoustic Efficiency of Individual Protection Equipment from Low- Frequency Noise And Infrasound KW anti-noise earphones KW low-frequency noise KW acoustic efficiency KW protection against an infrasound. JO Safety in Technosphere AU , .. AU Zinkin, V.. AU Bogomolov, A.. AU Eremin, G.. PY 2013 IS 2 PB INFRA-M Academic Publishing LLC.