Linear Sections of Algebraic Varieties Andrew Wallace Indiana University Mathematics Journal 1971 text pdf 10.1512/iumj.1971.20.20106 10.1512/iumj.1971.20.20106 en Indiana Univ. Math. J. 20 (1971) 1153 - 1162 state-of-the-art mathematics http://iumj.org/access/