@article {403,
	title = {Variation in the appearance of swallow eggs and the detection of intraspecific brood parasitism},
	journal = {Condor},
	volume = {91},
	year = {1989},
	note = {Hirundinidae},
	pages = {620-627},
	keywords = {yesnest},
	author = {Brown, C. R. and L. R. Sherman}
}
