@book{121657,
	author = {Wratil, Melani. and ebrary, Inc.},
	title = {Null pronouns},
	publisher = {De Gruyter Mouton,},
	year = {2011.},
	series = {Studies in generative grammar ;},
	address = {Berlin ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10515785}
}