00704nam0-22002411i-450-990001193580403321000119358FED01000119358(Aleph)000119358FED0100011935820000920d1973----km-y0itay50------baengOperators, oscillations, waves (open systems)by LIVSIC M.S.Providence (RI)American Mathematical Society1973Livsic,Moshe S.56199ITUNINARICAUNIMARCBK990001193580403321C-29-(3419965MA1MA1Operators, oscillations, waves (open systems341433UNINAING01