@book{15774,
	author = {Conference on "Differential Geometric Methods in Mathematical Physics", Clausthal, FRG, July 23-25, 1980. and Doebner, H. D.},
	title = {Differential geometric methods in mathematical physics; proceedings of an international conference},
	publisher = {Springer-Verlag,},
	year = {1982},
	address = {Berlin:}
}