Reference

Levitus, S., T.P. Boyer, M.E. Conkright, T. O'Brien, J. Antonov, C. Stephens, L. Stathoplos, D. Johnson, R. Gelfeld (1998) NOAA Atlas NESDIS 18, WORLD OCEAN DATABASE 1998: Vol. 1: Introduction, U.S. Gov. Printing Office, Vol. 1: Introduction, U.S. Gov. Printing Office, Wash., D.C., 346 pp.