Joo, R.; Grados, D.; Bouchon, M.; Díaz, E. Optimum Sample Size for a Program of Observers on Board Fishing Vessels Targetting Peruvian Anchovy (Engraulis Ringens). Rev peru biol 2016, 23 (2), 169-182. https://doi.org/10.15381/rpb.v23i2.12429.