00911nam0-22003011i-450-99000050172040332120071001103617.00-08-017803-0000050172FED01000050172(Aleph)000050172FED0100005017220020821d1974----km-y0itay50------baenga-------001yyIntroduction to gas laserspopulation inversion mechanismswith emphasis on selective excitation processesColin S. WillettOxfordPergamon Pressc1974528 p.ill.26 cmInternational series of monographs in natural philosophy67Gas laser621.366Willett,Colin SidneyITUNINARICAUNIMARCBK99000050172040332110 B III 948891DINELDINELUNINA