@Unpublished{K-theory/0571,
  author = 	 {{P. Hu, I. Kriz, and J.P. May}},
  title = 	 {{Cores of spaces, spectra, and E_infty ring spectra}},
  note = 	 {{Preprint, June 8, 2002, K-theory Preprint Archives, http://www.math.uiuc.edu/K-theory/0571/}}}
}