"Earth orbits." . . "Tethered satellites." . . "Space stations." . . "Mathematical models." . . "Tethering." . . "Attitude control." . . . . "Stationkeeping." . . . . . . . . . . . . . "Analytical investigation of the dynamics of tethered constellations in Earth orbit (phase II) final report for the period 22 February 1985 through 31 March 1994"@en . . . . . . . . . "Simulators." . .