Template:HaefligerSteer1965
From Manifold Atlas
A. Haefliger and B. Steer, Symmetry of linking coefficients, Comment. Math. Helv., 39 (1965), 259--270.pdf
A. Haefliger and B. Steer, Symmetry of linking coefficients, Comment. Math. Helv., 39 (1965), 259--270.pdf