TY - JOUR T1 - Note on the Central Differential Equation in the Relativity Theory of Gravitation JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 97 IS - 682 SP - 145 EP - 151 PY - 1920/04/01/ UR - http://dx.doi.org/10.1098/rspa.1920.0019 M3 - doi:10.1098/rspa.1920.0019 AU - Forsyth, A. ER -