Lenz, S., N. Dubois, J. Geist, and U. Raeder. “Phacotus Lenticularis Content in Carbonate Sediments and Epilimnion in Four German Hard Water Lakes: P. Lenticularis Content in German Hard-Water Lakes”. Journal of Limnology, vol. 79, no. 2, Apr. 2020, doi:10.4081/jlimnol.2020.1945.