@PhdthesisMisc{W69_940,
author = {Walter Flury},
title = {Integrations-theorie von Krylow-Bogoljubow und gest\"orte Keplerbewegung},
note = {Dis_no 4358, Prof. Dr. Eduard Stiefel},
school = {ETH Z{\"u}rich},
doi = {http://dx.doi.org/10.3929/ethz-a-000093478},
year = {1969}
}