Continuous Maps with 0-Dimensional Branch Set P. ChurchJ. Timourian Indiana University Mathematics Journal 1974 text pdf 10.1512/iumj.1974.23.23077 10.1512/iumj.1974.23.23077 en Indiana Univ. Math. J. 23 (1974) 949 - 958 state-of-the-art mathematics http://iumj.org/access/