  The question of the stability of unstable states of dynamical systems that do
not explicitly contain a small parameter, chaos and bifurcations in them has
attracted attention ever since [1-14]. This is due to the fact that this
problem often arises not only in mathematics, but also in various fields of
mechanics and physics. In particular, the task of retaining atomic particles in
electrodynamic traps has recently become of special interest [14]...
