(Z_2)^k-Actions and Characteristic Numbers Czes KosniowskiR. Stong Indiana University Mathematics Journal 1979 text pdf 10.1512/iumj.1979.28.28051 10.1512/iumj.1979.28.28051 en Indiana Univ. Math. J. 28 (1979) 725 - 743 state-of-the-art mathematics http://iumj.org/access/