Template:Petrie1970
From Manifold Atlas
T. Petrie, The Atiyah-Singer invariant, the Wall groups , Topology of Manifolds (Proc. Inst., Univ. of Georgia, Athens, Ga., 1969), Markham, Chicago, Ill. (1970), 490–499. MR0279829 (43 #5550) Zbl 0279.57009