Grašyte, G., S. Rumbutis, M. Dagys, D. Vaitkuviene, and R. Treinys. “Tawny Owl Females of Intermediate Colour Morph reproduce better and Increase in a Local Polymorphic Population”. Ornis Fennica, vol. 94, no. 1, Mar. 2017, pp. 33–44, doi:10.51812/of.133910.