Extended Feynman formula for time-dependent forced harmonic oscillator

Extended feynman formula for forced harmonic oscillator

Extended Feynman formula for damped harmonic oscillator with time-dependent perturbative force

Extended Feynman formula for harmonic oscillator

On the extended Feynman formula for the harmonic oscillator

Feynman Path Integral and Schwinger Method for Time-Dependent Mass Harmonic Oscillators

On the forced harmonic oscillator with time-dependent frequency