Close Identification of marine eddies from altimetric maps,
Isern-Fontanet, J., E. García-Ladona, J. Font (2003) (2003),
Journal of Atmospheric and Oceanic Technology, 20, 5 p. 772–778,
10.1175/1520-0426(2003)20%3C772:IOMEFA%3E2.0.CO;2.