  In this work, we have applied the integrals of motion method in a nonunitary
approach and so obtained the time-dependent displacement and squeezed
parameters of the coherent squeezed states (CSS). On its turn, CSS for
one-dimensional systems with general time-dependent quadratic Hamiltonian are
constructed. We discuss the properties of these states, in particular,
minimization of uncertainty relation and transition probabilities. As an
application, we calculate the CSS of an oscillator with a time-dependent
frequency and shown that the solution can be obtained from these well-known
Mathieu's equation.
