Wulker, W. “<i>Chironomus fraternus</i> Sp. N. and <i>C. beljaninae</i> Sp. n., Sympatric Sister Species of the <i>aberratus</i> Group in Fennoscandian Reservoirs”. Entomologica Fennica, vol. 2, no. 2, June 1991, pp. 97-109, doi:10.33338/ef.83540.