Communication to : 34th AIAA Aerospace sciences meeting and exhibit, Reno, NV (USA), january 15-18, 1996SIGLEAvailable at INIST (FR), Document Supply Service, under shelf-number : 22419, issue : a.1996 n.21 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc