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Theo Douma
Prey supply of otters (Lutra lutra) in small rivers in north-eastern Belarus: census method used and preliminary data obtained
Using molecular markers and PCB analysis to infer the origin of the otter (Lutra lutra) found on the Knardijk, The Netherlands, in 1998
A review of the transect method by comparing it with three other counting methods to estimate rabbit (Oryctolagus cuniculus) density