1. Abe, N.: The colony of the limpet (Acmaea dorsuosa Gould). Scient. Rep. Tôhoku imp. Univ. (Ser. IV, Biol.) 12, 169?187 (1932)
2. Bannister, J.V.: Some adaptational differences in the limpets Patella caerulea and Patella lusitanica in relation to zonation, 105 pp. Malta: University Press 1972
3. Croxton, F.E.: Elementary statistics with application in medicine and the biological sciences, 376 pp. New York: Dover Publications, Inc. 1953
4. D'Arcy Thompson, W.: On growth and form, 254 pp. London: Cambridge University Press 1952
5. Davies, P.S.: Physiological ecology of Patella. III. Desiccation effects. J. mar. biol. Ass. U.K. 49, 291?307 (1969)