Hedgepeth, J., Gallucci, V. F., Campos, J. and Mug, M. (2000) “Hydroacoustic estimation of fish biomass in the Gulf of Nicoya, Costa Rica”, Revista de Biología Tropical, 48(2-3), pp. 371–387. doi: 10.15517/rbt.v48i2-3.18754.