Side-aspect target strength of Atlantic salmon (Salmo salar), brown trout (Salmo trutta), whitefish (Coregonus lavaretus), and pike (Esox lucius)Juha Lilja, Timo J. Marjomäki, Raimo Riikonen and Juha JurveliusAquat. Living Resour., 13 5 (2000) 355-360DOI: https://doi.org/10.1016/S0990-7440(00)01072-X