Oza, A. U., Rosales, R. R., & Bush, J. W. (2013). A trajectory equation for walking droplets: hydrodynamic pilot-wave theory. Journal of Fluid Mechanics,737, 552-570.
http://math.mit.edu/~bush/wordpress/wp-content/uploads/2013/12/ORB-JFM.pdf
Integro-differential equation describing the horizontal motion of a walking droplet
Stability to perturbations