D. Byriel, B. Kristensen, K. Klitgaard, and R. Bødker, “Relative abundance and geographical variation of Culex pipiens and Culex torrentium (Diptera: Culicidae) in CO2-baited traps in Denmark”, Entomol. Fennica, vol. 29, no. 3, pp. 112–118, Dec. 2018.