Boundary conditions for zero-rest-mass fields in curved space-time: A regularity theoremDOI: info:10.1063/1.524990v. 221081–1083
Anderson, James L. and Kates, Ronald E. 1981. "Boundary conditions for zero-rest-mass fields in curved space-time: A regularity theorem." Journal of Mathematical Physics, 22 1081–1083. https://doi.org/10.1063/1.524990.