Vreča, Polona, and Gregor Muri. “Stable Isotopic Composition of Sedimentary Organic Carbon and Nitrogen As Indicator of Trophic State Changes in High-Mountain Lakes in the Julian Alps ”. Geologija, vol. 45, no. 2, Dec. 2002, pp. 607-12, https://doi.org/10.5474/geologija.2002.073.