Propagation of ocean swell across the Pacific,
Snodgrass, F. E, G. W. Groves, K. F. Hasselmann, G. R. Miller, W. H. Munk, W. H. Powers (1966),
Phil. Trans. Roy. Soc. London, 259 (1103) p. 431–497,
10.1098/rsta.1966.0022.