HINEVA, Elitsa, 		PANAYOTOV, Valentin, 		STEFANOVA, Elitsa, AND 		STAMATOVA, Hristiyana.
" A study on the light attenuation caused by periphyton in the Burgas Bay, the Black Sea" <em>Geo-Eco-Marina</em> [Online], Volume 26(31 December 2020)