Acta Astronautica
Acta Astronautica > 2009 > 64 > 2-3 > 206-211
Acta Astronautica > 2009 > 65 > 3-4 > 537-548
Acta Astronautica > 2009 > 65 > 5-6 > 879-891
Acta Astronautica > 2009 > 65 > 7-8 > 1094-1097
Acta Astronautica > 2009 > 65 > 11-12 > 1668-1678