@article{Mateus_2010, title={Surveying drainage culvert use by carnivores: sampling design and cost–benefit analyzes of track-pads vs. video-surveillance methods}, volume={181}, ISSN={1573-2959}, url={http://dx.doi.org/10.1007/s10661-010-1816-6}, DOI={10.1007/s10661-010-1816-6}, number={1-4}, journal={Environmental Monitoring and Assessment}, publisher={Springer Science and Business Media LLC}, author={Mateus, Ana Rita A. and Grilo, Clara and Santos-Reis, Margarida}, year={2010}, month=Dec, pages={101–109} }