@article{journal,
author = {Gallego, S. and Nadal, J. and Balcells, E.},
title = {Fauna ornitol{\'o}gica barcelonesa. IV. Observaciones en distintos biotopos},
year = {1974},
volume = {3-4},
pages = {137--141},
journal = {Miscel·l{\`a}nia Zool{\`o}gica}
}