@article{journal,
author = {Siriwardena, G. M. and Wernham, C. V. and Baillie, S. R.},
title = {Quantifying variation in migratory strategies using ring-recoveries},
year = {2004},
volume = {27.1},
pages = {299--317},
journal = {Animal Biodiversity and Conservation},
keywords = {Migration, Partial migration, Birds, Strategies, Ecology, Demography}
}