@book{50526,
	author = {Koksma, J. F. and SpringerLink (Online service)},
	title = {Diophantische Approximationen},
	publisher = {Chelsea publishing company, },
	year = {1935 },
	series = {Ergebnisse der Mathematik und Ihrer Grenzgebiete ;},
	address = {New york : },
	url = {http://www.columbia.edu/cgi-bin/cul/resolve?clio11931104}
}