[1] Laabs H,Gao C.J Mod Opt,1999,46(4):709~719.
[2] Eppich B,Gao C.Opt Laser Technol,1998,30:337~340.
[3] Eppich B,Fiberg A T.SPIE,1996,2870:260~267.
[4] Gao C,Laabs H.Opt Quant Electron,1999,34:1207~1218.
[5] Belafhal A,Ibnchaikh M.Opt Commum,2000,186:269~276.
[6] Gao C.Characterization and transformation of astigmatic laserbeams.Berlin:Wissenschaft und Technik Verlag,1999.