TY - RPRT TI - Time evolution of harmonic oscillators with time-dependent parameters: A step-function approximation. AU - T Kiss AU - J Janszky AU - P Adam PY - 1994 DO - 10.1103/physreva.49.4935 UR - https://pubmed.ncbi.nlm.nih.gov/9910814/ ID - 9910814 ER -