Ya. Avens-avenin'Sh et Va. Klimavichius, Effects of equation nonlinearity stiffness on the stability of a second-order parametric system, AUTOM C C S, 35(2), 2001, pp. 63-66
A theoretical study is performed on the effects of differential-equation no
nlinearity stiffness on the stability of a parametrically excited second-or
der system.