A Theorem on Spherically Symmetric Solutions in Unified Theory G. Bandyopadhyay Indiana University Mathematics Journal 1963 text pdf 10.1512/iumj.1963.12.12043 10.1512/iumj.1963.12.12043 en Indiana Univ. Math. J. 12 (1963) 655 - 662 state-of-the-art mathematics http://iumj.org/access/