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Rutanen, I. and Rassi, P. 1991. <i>Coelambus polonicus</i> (Aube) and <i>C. parallelogrammus</i> (Ahrens) new to the Finnish fauna (Coleoptera, Dytiscidae). Entomologica Fennica. 2, 1 (Jan. 1991), 23. DOI:https://doi.org/10.33338/ef.83503.