This answer to How are co-located satellites positioned relative to each other? links to the paywalled paper Separation of Geostationary Satellites with Eccentricity and Inclination Vector with the abstract:
Nowadays, locating several satellites in a narrow station-keeping window is a good way to make advantage of the geostationary orbit source problem. To avoid collision,drawbacks of close approach and mutual interferences, a method of multi-satellites separation using eccentricity vector and inclination vector is discussed in this paper. The principle and constraint equation of combined separation is investigated. The initial qualification, the eccentricity and inclination control strategy in W/E maneuver and N/S maneuver is given. Simulation shows that minimum distance separation more than 10 Km, and two Chinese geostationary satellites work in orbit with secure operation.
Question: Is it possible to explain and/or illustrate how this technique works; how it maintains a safe distance between colocated GEO satellites?
I'm thinking that in the synodic (rotating) frame the two satellites will appear to rotate around each other, but I'm having difficulty visualizing how this actually works.