@book{14711,
	author = {Symposium on Differential Equations and Dynamical Systems, Univ. of Warwick, Sept. 1968 to August 1969 and Chillingworth, David ; ed.},
	title = {Differential equations and dynamical systems; proceedings},
	publisher = {Springer-Verlag},
	year = {1971},
	address = {Berlin}
}