Mohd Nadzri Md. Reba Francesc Rocadenbosch Michaël Sicard Constantino Muñoz Sergio Tomás Piece-wise variance method for signal-to-noise ratio estimation in elastic/Raman lidar signals. 3158-3161 2007 IGARSS https://doi.org/10.1109/IGARSS.2007.4423515 conf/igarss/2007 db/conf/igarss/igarss2007.html#RebaRSMT07