Transition to chaos in classical and quantum mechanics : lectures given at the 3rd Session of the Centro Internazionale Matematico Estivo (C.I.M.E.) held in Montecatini Terme, Italy, July 6-13, 1991
“ In the end only three things matter: how much you loved, how gently you lived, and how gracefully you let go of things not meant for you. ” ― Anonymous
