Correspondences in a Finite Field, II L. Carlitz Indiana University Mathematics Journal 1975 text pdf 10.1512/iumj.1975.24.24063 10.1512/iumj.1975.24.24063 en Indiana Univ. Math. J. 24 (1975) 785 - 811 state-of-the-art mathematics http://iumj.org/access/