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2. On the one problem of stability of a pipe with a fluid flowing through it;Movchan;Prikl. Math. Mekh.,1965
3. A stability criterion for a panelflutter problem via the second method of Liapunov;Parks,1967
4. An introduction to the stability of distributed systems via Liapunov functional;Berger;AIChE J.,1968
5. Lyapunov functionals for a class of wave equations;Buis;Electronics Letters,1968