Ecological impact and cost-effectiveness of wildlife crossings in a highly fragmented landscape: a multi-method approach. - Sijtsma, Frans J.; van der Veen, Eelke; van Hinsberg, Arjen; Pouwels, Rogier; Bekker, Renée; van Dijk, René E.; Grutters, Mark; Klaassen, Raymond; Krijn, Margriet; Mouissie, Maarten; Wymenga, Eddy (Landscape Ecology, 2020)