Saniewski, Michał, and Tamara Zalewska. “90Sr in Zostera Marina from the Gulf of Gdańsk (southern Baltic Sea)”. Oceanological and Hydrobiological Studies, vol. 46, no. 1, Mar. 2017, pp. 24-29, https://czasopisma.bg.ug.edu.pl/index.php/oandhs/article/view/8823.