Mellink, E. 2003. Effects of the 1997-1998 El Niño and 1998-1999 La Niña events on breeding waterbirds and sea lions in the Upper Gulf of California, México. Geofísica Internacional. 42, 3 (jul. 2003), 539–546. DOI:https://doi.org/10.22201/igeof.00167169p.2003.42.3.944.