http://prola.aps.org/abstract/RMP/v21/i3/p447_1|titre=An Example of a New Type of Cosmological Solutions of Einstein's Field Equations of Gravitation (fr)
http://prola.aps.org/abstract/RMP/v21/i3/p447_1|titre=An Example of a New Type of Cosmological Solutions of Einstein's Field Equations of Gravitation (fr)