H. Kayal, O. Balagurin, and H. Wojtkowiak. 63rd International Astronautical Congress, IAC-12,B4,3,2,x13917, International Astronautical Federation, (2012)
H. Wojtkowiak, O. Balagurin, G. Fellinger, and H. Kayal. 6th International Conference on Recent Advances in Space Technologies (RAST), AIAA American Institute of Aeronautics and Astronautics, (2013)
H. Wojtkowiak, O. Balagurin, and H. Kayal. ILA-Workshop „Pico- und Nanosatellitenaktivitäten in Deutschland“, Deutsche Gesellschaft für Luft- und Raumfahrt, (2010)
H. Wojtkowiak, O. Balagurin, and H. Kayal. 62nd International Astronautical Congress, IAC-11,C1,6,7,x10267, International Astronautical Federation, (2011)