@article{Trenkler1996,
	title = {Dropping variables versus use of proxy variables in linear regression},
	author = {G. Trenkler and P. Stahlecker},
	day = {15},
	journal = {Journal of Statistical Planning and Inference},
	month = {Feb},
	number = {1},
	pages = {65--75},
	url = {http://www.sciencedirect.com/science/article/B6V0M-405TP0H-4/1/009fcdde68022a7d67b345d0b651352a},
	volume = {50},
	year = {1996},
	biburl = {http://www.bibsonomy.org/bibtex/2862daa2c10b2314a80edcce9e7844200/smicha},
	keywords = {62J05 }
}