@book{8377,
	author = {Yong, C. N. and Others and Penrose, R. ; jt. auth.},
	title = {Hermenn Weyl 1885-1985; centenary lectures delivered by C. N. Yang, R. Penrose and A. Boral},
	publisher = {Springer-Verlag},
	year = {1986},
	address = {Berlin}
}