Byrkjedal, I., Kyllingstad, K., Efteland, S. and Grøsfjell, S. (2012) “Population trends of Northern Lapwing, Eurasian Curlew and Eurasian Oystercatcher over 15 years in a southwest Norwegian farmland”, Ornis Norvegica, 35, pp. 16–22. doi: 10.15845/on.v35i0.238.