Fundamental Groups of Plane Curves and Their Duals Harold Abelson Indiana University Mathematics Journal 1976 text pdf 10.1512/iumj.1976.25.25004 10.1512/iumj.1976.25.25004 en Indiana Univ. Math. J. 25 (1976) 65 - 67 state-of-the-art mathematics http://iumj.org/access/