TY - JOUR T1 - The complex narrow line region in NGC 4151 JO - Astrophysics and Space Science PY - 1990/09/01 AU - P�rez E AU - Gonz�lez-Delgado RM AU - Tadhunter C AU - Tsvetanov Z ED - DO - DOI: 10.1007/bf00646823 PB - Springer Science and Business Media LLC VL - 171 IS - 1-2 SP - 71 EP - 75 Y2 - 2024/12/23 ER -