H. Seirafi, F. Farnaghi, A. Ehsani, M. Asghari Shiekhi, F. Gholamali, and P. Noormohammadpour, “Refractory Port Wine Stains (PWS): Long Pulsed Alexandrite Laser as an Option”, J laser Med Sci, vol. 3, no. 4, pp. 160–164, Sep. 2012.