Madsen, P.A.; O.R. Sørensen, and H.A. Schäffer (1997). "Surf zone dynamics simulated by a Boussinesq type model. Part I. Model description of cross-shore motion of regular waves". Coastal Engineering. 32 (4): 255–287. Bibcode:1997CoasE..32..255M. doi:10.1016/S0378-3839(97)00028-8. ISSN0378-3839.
Madsen, P.A.; O.R. Sørensen, and H.A. Schäffer (1997). "Surf zone dynamics simulated by a Boussinesq type model. Part I. Model description of cross-shore motion of regular waves". Coastal Engineering. 32 (4): 255–287. Bibcode:1997CoasE..32..255M. doi:10.1016/S0378-3839(97)00028-8. ISSN0378-3839.
Surfer (15 September 2014). "Bigger and Better". Surfer Magazine. Surfer Magazine. Retrieved 29 December 2014. {{cite news}}: External link in |ref= (help)
Madsen, P.A.; O.R. Sørensen, and H.A. Schäffer (1997). "Surf zone dynamics simulated by a Boussinesq type model. Part I. Model description of cross-shore motion of regular waves". Coastal Engineering. 32 (4): 255–287. Bibcode:1997CoasE..32..255M. doi:10.1016/S0378-3839(97)00028-8. ISSN0378-3839.
zigzag.co.za
Clayton Truscott (23 September 2009). "Seli 1: One Year On". ZigZag. Online Publishers Association South Africa. Retrieved 25 May 2012.