context source (Schelde)Maris, T., O. Beauchard, S. Van Damme, E. Van den Bergh, S. Wijnhoven & P. Meire. (2013). Referentiematrices en Ecotoopoppervlaktes Annex bij de Evaluatiemethodiek Schelde-estuarium Studie naar “Ecotoopoppervlaktes en intactness index”. [Reference matrices and Ecotope areas Annex to the Evaluation methodology Scheldt estuary Study on “Ecotope areas and intactness index”. <em>Monitor Taskforce Publication Series, 2013-01. NIOZ: Yerseke.</em> 35 pp. (look up in RoR) [details]
basis of recordBrown, L.H., E.K. Urban & K. Newman. (1982). The Birds of Africa, Volume I. <em>Academic Press, London.</em> [details]