W. Lehle. Proceedings of the 24th International Conference on Environmental Systems and the 5th European Symposium on Space Environmental Control Systems, Warrendale, PA, SAE International, (1994)
P. Krus, and J. Nyman. Proceedings of the 22nd international Congress of Aeronautical Sciences, International Council of the Aeronautical Sciences : American Institute of Aeronautics and Astronautics : Optimage Ltd., (September 2000)
B. Burnell, R. Bitmead, and A. Connolly. Proceedings of the 41st IEEE Conference on Decision and Control, 4, page 4649 - 4651. The Venetian Hotel, Las Vegas, Nevada, USA, IEEE, (10-13 December 2002)