@article{805501,
  author = {K Petrov and S Waltman and E Dlugokencky and M Arbore and M Fejer and F Tittel and Leo Hollberg},
  title = {Precise Measurement of Methane in Air Using Diode-Pumped 3.4 υm Difference-Frequency Generation in PPLN},
  year = {1997},
  number = {64},
  month = {1997-01-01 00:01:00},
  publisher = {Appl Phys B},
  language = {en},
}