'A' cited 'B'.

'A'
Title: Diffraction of a finite-radius plane wave and a Gaussian beam by a helical axicon and a spiral phase plate
Author(s): Kotlyar VV (Kotlyar, Victor V.), Kovalev AA (Kovalev, Alexey A.), Skidanov RV (Skidanov, Roman V.), Moiseev OY (Moiseev, Oleg Yu.), Soifer VA (Soifer, Victor A.)
Source: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION 24 (7): 1955-1964 JUL 2007
Authors' address:
Samara State Aerospace Univ, Russian Acad Sci, Image Proc Syst Inst, Samara 443001, Russia

'B'
Title: Real-time digital holographic beam-shaping system with a genetic feedback tuning loop
Author(s): Hahn J, Kim H, Choi K, Lee B
Source: APPLIED OPTICS 45 (5): 915-924 FEB 10 2006