@article{Martijn Salomons2006,
author = {Martijn Salomons, H. and Müller, W. and Dijkstra, C. and Eising, C.M. and Verhulst, S.},
title= {No sexual differences in embryonic period in jackdaws Corvus monedula and black-headed gulls Larus ridibundus},
year = {2006},
doi = {10.1111/j.0908-8857.2006.03614.x},
journal = {Journal of Avian Biology},
volume = {37},
number = {1},
pages = {19--22},
}