Prime Divisors and Saturated Chains Edward DavisStephen McAdam Indiana University Mathematics Journal 1977 text pdf 10.1512/iumj.1977.26.26052 10.1512/iumj.1977.26.26052 en Indiana Univ. Math. J. 26 (1977) 653 - 662 state-of-the-art mathematics http://iumj.org/access/