00954nam0-22003131i-450-990000254510403321200010100-08-017803-0000025451FED01000025451(Aleph)000025451FED0100002545120001010d--------km-y0itay50------baitay-------001yyIntroduction to gas lasersPolupation inversion mechanismsWith emphasis on selective excitation processesBy ColinS. Willett.OxfordPergamon Presscopyr. 1974XIV, 528 p. ill. 1 tav. f. t. 26 cmInternational series of monographs in natural philosophy67Fisica generale621.36Willett,Colin SidneyITUNINARICAUNIMARCBK99000025451040332109 024-1003467DINAEDINAEUNINAING01