Search Results       Your search for [author]Kirchgraber, Urs, 1945- returned 1 record.           An analytical perturbation theory based on polar coordinates in the four-dimensional KS-space. (Application to the motion of an artificial satellite). by Kirchgraber, Urs, 1945-; Zurich: Juris-Verlag, 1972. Subject: Artificial satellites -- Orbits; Perturbation (Mathematics); Coordinates, Polar.          Add to Book Cart Relevance: 28.73%