BRAIG, E., G. WELZL, W. STICHLER, U. RAEDER, and A. MELZER. “Entrainment, Annual Circulation and Groundwater Inflow in a Chain of Lakes As Inferred by Stable 18O Isotopic Signatures in the Water Column”. Journal of Limnology, vol. 69, no. 2, Aug. 2010, pp. 278-86, doi:10.4081/jlimnol.2010.278.