@book{10919,
	author = {Boardman, J. M. and Vogt, R. M. and Vogt, R. M. ; jt. auth.},
	title = {Homotopy invariant algebraic structures on topological spaces},
	publisher = {Springer-Verlag},
	year = {1973},
	series = {Lecture notes in Mathematics},
	address = {Berlin}
}