Rigorous Static Solution, Corresponding to a Particular Form of the Fundamental Tensor, in Schroedinger Unified Field Theory R. Sarkar Indiana University Mathematics Journal 1965 text pdf 10.1512/iumj.1965.14.14014 10.1512/iumj.1965.14.14014 en Indiana Univ. Math. J. 14 (1965) 183 - 193 state-of-the-art mathematics http://iumj.org/access/