@book{35566,
	author = {Andreescu, Titu. and Feng, Zuming. and SpringerLink (Online service)},
	title = {103 Trigonometry Problems},
	publisher = {Birkhäuser Boston,},
	year = {2005.},
	address = {Boston, MA :},
	url = {http://dx.doi.org/10.1007/b139082}
}