@book{32307,
	author = {Campbell, H. E. A. Eddy and Wehlau, David L. and Wehlau, David L. ; jt. auth.},
	title = {Encyclopaedia of Mathematical Sciences},
	publisher = {Springer-Verlag},
	year = {2011},
	series = {Encyclopaedia of Mathematical Sciences },
	address = {Berlin}
}