@article{journal,
author = {Callejo, A. and Delibes, M.},
title = {Dieta de la nutria Lutra lutra (Linnaeus, 1758) en la cuenca del alto Ebro, norte de Espa{\~n}a},
year = {1987},
volume = {11},
pages = {353--362},
journal = {Miscel·l{\`a}nia Zool{\`o}gica},
keywords = {Otter, Lutra lutra, Food habits, Salmonids, Crayfish, River Ebro}
}