Häggström, Martin; Lindström, Göran; Cobos, Carlos; Martínez, Julio Roberto; Merlos, Leonardo; Alonzo, Roberto Dimas; Castillo, Glenda; Sirias, Carolina; Miranda, Douglas; Granados, Jorge; Alfaro, Rosario; Robles, Edgar; Rodríguez, Mercedes; Moscote, Rigel
(Swedish Meteorological and Hydrological Institute (SMHI), 1990)