@article{Lang1989,
	title = {Why was there mandatory retirement?},
	author = {Kevin Lang},
	journal = {Journal of Public Economics},
	month = {Jun},
	number = {1},
	pages = {127--136},
	url = {http://www.sciencedirect.com/science/article/B6V76-45911DN-5K/1/c5bee5c05efe9b0dfd1cdc9a3a65a022},
	volume = {39},
	year = {1989},
	biburl = {http://www.bibsonomy.org/bibtex/2a0c660cde1894b4581197e21ca8c1c9f/smicha},
	keywords = {imported }
}