CurrentsElken, JüriEncyclopedia of marine geosciences2016 / p. 139-142 : tab https://doi.org/10.1007/978-94-007-6238-1_158 WavesSoomere, TarmoEncyclopedia of marine geosciences2016 / p. 940-944 : tab http://doi.org/10.1007/978-94-007-6238-1_142