Involutions of Cohomology Complex Projective Space with Codimension-Two Fixed Points Karl DovermannRobert Little Indiana University Mathematics Journal 1992 text pdf 10.1512/iumj.1992.41.41011 10.1512/iumj.1992.41.41011 en Indiana Univ. Math. J. 41 (1992) 197 - 211 state-of-the-art mathematics http://iumj.org/access/