International Journal of Mathematics and Mathematical Sciences
Volume 28 (2001), Issue 10, Pages 571-580
doi:10.1155/S0161171201007153
Abstract
For a pair of point vortices in an inviscid, incompressible fluid
in the plane, the relative and absolute motion are determined when
the vortices move under the influence of (1) each other, and (2)
a steady, linear, and elliptical background flow.