Popa, N.     About optimizing of the initial state by dynamic systems diagnose [Текст] / N. Popa, M. Enescu // The World Congress "Aviation in the X X I-st Century", 14-16 september / International Civil Aviation Organization; Ministry of Education and Science of Ukraine; National Academy of Sciences of Ukraine; National Aviation University. — Kyiv : NAU, 2003. — С. 8.41.