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[2] Kokotovic, P. V. and R. A. Vackel, Singular perturbation theory of linear state regulaters, IEEE Trans. Aut. Contr., AC-17 (1972), 29-37.
[3] Lions, J. L., Controle Optimal de Systems9 Gouvernes Par des Equations aux Derivees Partielleso Dunod, Paris (1968); (English trans, by S. K. Mitter. Springer) (1971).
[4] Visik, M. I. and L. A. Lyusternik, Regular degeneration and boundary layer for linear differential equations with small parameter, Usp. Mat. Nauko 12, 5 (77), 3-122 (in Russian); AMS Transl., ser. 2, 20, (1962), 239-364.
[5] Lin Zong-chi, Perturbations of solution and characteristic value and characteristic function of elliptic differential equations of order 2 in the case of boundary perturbation, Report Acad. SSSR, 157, 4 (1964), 784-787. (in Russian)
[6] Lions, J. L., Perturbations singulieres dans les problems aux limites et en controle optimal, Lecture Notes in Mathematibs, Springer-Verlag (1973). |
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