@article{journal,
author = {Muntaner, J. and Ferrer, X.},
title = {Invemada del Porr{\'o}n bastardo Aythya marila en Espa{\~n}a},
year = {1981 (1983)},
volume = {7},
pages = {139--144},
journal = {Miscel·l{\`a}nia Zool{\`o}gica},
keywords = {Muntaner, J.}
}