Warning: ini_set(): Session ini settings cannot be changed when a session is active in /var/www/osjournal.org/ojs/lib/pkp/classes/session/SessionManager.inc.php on line 71

Krikos, C. (2020). Definition of mass and production of equations of general relativity. Open Science Journal, 5(3). https://doi.org/10.23954/osj.v5i3.2543