On Some Conjectures in Neutron Transport Theory P. Diananda Indiana University Mathematics Journal 1963 text pdf 10.1512/iumj.1963.12.12041 10.1512/iumj.1963.12.12041 en Indiana Univ. Math. J. 12 (1963) 635 - 642 state-of-the-art mathematics http://iumj.org/access/