Hessen , D. O., J. Borgeraas, K. Kessler, and U. H. Refseth. “UV-B Susceptibility and Photoprotection of Arctic Daphnia Morphotypes”. Polar Research, vol. 18, no. 2, Jan. 1999, pp. 345-52, doi:10.3402/polar.v18i2.6594.