@PhdthesisMisc{C68_935, author = {Claude Alain Burdet}, title = {Theory of Kepler motion}, note = {Dis_no 4010, Prof. Dr. Eduard Stiefel}, school = {ETH Z{\"u}rich}, doi = {http://dx.doi.org/10.3929/ethz-a-000085657}, year = {1968} }