Integral closure of unstable Steenrod algebra actions

J.F. Adams, Private communication. Adams, 1976, Maps between classifying spaces, Invent. Math., 35, 1, 10.1007/BF01390132 J.F. Adams and C.W. Wilkerson, Ap embedding theorems, work in progress. J.F. Adams, Address, 1976 Summer AMS Annual Meeting, Toronto. Epstein, 1962, Cohomology operations Okugawa, 1963, Basic properties of differential fields of an arbitrary characteristics and the Picard-Vessiot theory, Mem. Coll. Sci. Kyoto Univ., A 2–3, 295 Quillen, 1971, The spectrum of an equivariant cohomology ring I, II,, Annals of Math., 549, 10.2307/1970770 Serrce, 1965, Sur la dimension cohomologique des groupes profini, Topology, 413, 10.1016/0040-9383(65)90006-6 Wilkerson, 1977, Classifying spaces, Steenrod operations and algebraic closure, Topology, 16, 227, 10.1016/0040-9383(77)90003-9