1. Bogomolov, V.A., Motion of an Ideal Fluid of Constant Density in the Presence of Sinks, Fluid Dyn., 1976, vol. 11, no. 4, pp. 508–513; see also: Izv. Akad. Nauk SSSR Mekh. Zidk. Gaza, 1976, no. 4, pp. 21–27.
2. Borisov, A.V. and Mamaev, I. S., Mathematical Methods in the Dynamics of Vortex Structures, Moscow-Izhevsk: R&C Dynamics, Institute of Computer Science, 2005 (Russian).
3. Borisov, A.V. and Mamaev, I. S., On the Problem of Motion Vortex Solurces on a Plane, Regul. Chaotic Dyn., 2006, vol. 11, no. 4, pp. 455–466.
4. Chenciner, A. and Montgomery, R., A Remarkable Periodic Solution of the Three-Body Problem in the Case of Equal Masses, Ann. of Math. (2), 2000, vol. 152, no. 2, pp. 881–901.
5. Fridman, A.A. and Polubarinova, P.Ya., On Moving Singularities of a Flat Motion of an Incompressible Fluid, Geofiz. Sb., 1928, vol. 5, no. 2, pp. 9–23 (Russian).