Gutiérrez Torero, M., Herrera Almirón, N. and Marín Sánchez, D. 1999. Distribution and abundance of Peruvian anchovy and other pelagic species between El Niño 1982-83 and 1997-98. Boletin Instituto del Mar del Perú. 18, 1-2 (Dec. 1999), 77–88.