@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}, }