Stichelbaut et al. 2016, pp. 64–72. Stichelbaut, Birger; Gheyle, Wouter; Saey, Timothy; Van Eetvelde, Veerle; Van Meirvenne, Marc; Note, Nicolas; Van den Berghe, Hanne; Bourgeois, Jean (1 January 2016). "The First World War from Above and Below. Historical Aerial Photographs and Mine Craters in the Ypres Salient". Applied Geography. LXVI: 64–72. doi:10.1016/j.apgeog.2015.11.020. ISSN0143-6228.
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Stichelbaut et al. 2016, pp. 64–72. Stichelbaut, Birger; Gheyle, Wouter; Saey, Timothy; Van Eetvelde, Veerle; Van Meirvenne, Marc; Note, Nicolas; Van den Berghe, Hanne; Bourgeois, Jean (1 January 2016). "The First World War from Above and Below. Historical Aerial Photographs and Mine Craters in the Ypres Salient". Applied Geography. LXVI: 64–72. doi:10.1016/j.apgeog.2015.11.020. ISSN0143-6228.
