TY - JOUR AU - Nielsen, H B; Ludvigsen, C TI - Effect of hearing aids with directional microphones in different acoustic environments JO - Scand Audiol IS - 04 VL - 7 PY - 1978 DO - 10.3109/01050397809076289 L3 - PubMed-ID: 756087 SP - 217 EP - 224 ER -