Mihelsons, H., Viksne, J. and Lejins, G. (1966) “Experience in waterfowl management under the conditions prevailing in the Latvian S.S.R”, Wildfowl, pp. 146–149. Available at: https://tidsskrift.dk/Wildfowl/article/view/155596 (Accessed: 13 February 2026).