TY  - JOUR
T1  - A Letter from Mr. John Robertson, Lib. R. S. to James West, Esq; President of the Royal Society; Containing the Demonstration of a Law of Motion, in the Case of a Body Deflected by Two Forces Tending Constantly to Two Fixed Points
JF  - Philosophical Transactions (1683-1775)
VL  - 59
SP  - 74
EP  - 78
PY  - 1769/01/01/
UR  - http://dx.doi.org/10.1098/rstl.1769.0012
M3  - doi:10.1098/rstl.1769.0012
AU  - Robertson, J.
ER  -