\input zb-basic
\input zb-ioport
\iteman{io-port 03671778}
\itemau{Grigorenko, O.Ya.}
\itemti{Nonlinear problem of surface instability.}
\itemso{Dopov. Akad. Nauk Ukr. RSR, Ser. A 1979, 722-725 (1979).}
\itemcc{}
\itemut{surface instability; supercritical deformation; free surface; linear- elastic isotropic half-plane}
\itemli{}
\end