@article{York2019, author = "Collin E. York", title = "{Application of a Two-Level Targeter for Low-Thrust Spacecraft Trajectories}", year = "2019", month = "1", url = "https://hammer.purdue.edu/articles/thesis/Application_of_a_Two-Level_Targeter_for_Low-Thrust_Spacecraft_Trajectories/7433939", doi = "10.25394/PGS.7433939.v1" }