Shapoval, N. A., G. N. Shapoval, and A. P. Shapoval. “New, Rare and Vagrant Damselflies and Dragonflies (Insecta: Odonata) in the Kaliningrad Oblast, North-Western Russia”. Acta Biologica Sibirica, Vol. 8, Sept. 2022, pp. 261–279, doi:10.5281/zenodo.7703376.