Karl Schwarzschild (1873-1916) solves the Einstein vacuum field equations for uncharged spherically symmetric systems
Editors. "The first exact solution to the Einstein field equations of general relativity". The Literary Encyclopedia. First published 01 May 2009; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=6447, accessed 19 April 2015.]