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3. L. M. Kurshin and K. A. Matveev, ?Study of the stability of rectangular plates with notches,? Izv. Akad. Nauk SSSR, Mekh. Tverd. Tela, No. 6, 162?163 (1978).
4. I. N. Preobrazhenskii, Stability and Vibrations of Plates and Shells with Holes [in Russian], Mashinostroenie, Moscow (1981).
5. V. L. Rvachev, Theory of R-Functions and Some of Its Applications [in Russian], Naukova Dumka, Kiev (1982).