Erikson, Rolf and Pum, Manfred and Vammen, Katherine and Cruz Granja, Adela del Carmen and Ruíz, M and Zamora, H (1997) Nutrient Availability and the Stability of Phytoplankton Biomass and Production in Lake Xolotlán (Lake Managua, Nicaragua). Limnologica, 27 (2). pp. 157-164.