[1] U. Platt, D. Perner, H. W. Ptz. Simultaneous measurements of atmospheric CH2O, O3 and NO2 by differential optical absorption[J]. Geophys. Res.,1979, 84(10): 6329~6335
[2] Platt U, Perner D. Direct measurements of atmospheric CH2O, HNO2, O3 and SO2 by differential absorption in the near UV[J]. Geophys. Res., 1980, 85(12): 7453~7458
[3] Jochen Stutz, Ulrich Platt. Numerical analysis and estimation of the statistical error of differential optical absorption spectroscopy measurement with least-squares methods[J]. Appl. Opt., 1996, (35): 6041~6053
[8] Donoho D L. De-Noising by soft-thriesholding[J]. IEEE Trans. on Information Theory, 1995, 41(3): 613~620