@PhdthesisMisc{M73_965,
author = {Michael Vitins},
title = {Regular orbital and rotational elements for artificial satellites},
note = {Dis_no 5174, Prof. Dr. Eduard Stiefel},
school = {ETH Z{\"u}rich},
doi = {http://dx.doi.org/10.3929/ethz-a-000085444},
year = {1973}
}