Durlofsky, Louis, John F. Brady, and Georges Bossis. "Dynamic simulation of hydrodynamically interacting particles." Journal of fluid mechanics 180.1 (1987): 21-49 doi10.1017/S002211208700171X, equations (2.15a, b, c). Note sign change.
Batchelor, G. K.; Green, J. T. (1972). «The hydrodynamic interaction of two small freely-moving spheres in a linear flow field». J. Fluid Mech.56 (2): 375-400. Bibcode:1972JFM....56..401B. doi:10.1017/S0022112072002435.
Batchelor, G. K.; Green, J. T. (1972). «The hydrodynamic interaction of two small freely-moving spheres in a linear flow field». J. Fluid Mech.56 (2): 375-400. Bibcode:1972JFM....56..401B. doi:10.1017/S0022112072002435.