1. Randomized controlled study of human zona pellucida dissection using the zona infrared laser optical system: evaluation of blastomere damage, embryo development, and subsequent hatching 
Benjamin C Wong, M.D., Catherine A Boyd, B.S., Susan E Lanzendorf, Ph.D. 
Fertility and Sterility 
Volume 80, Issue 5, Pages (November 2003)
DOI: /S (03)

2. FIGURE 1
Photomicrograph of human eight-cell embryo after partial hatching of the zona pellucida (arrows mark margins of defect). Original magnification, ×400.
Wong. Human embryo laser hatching using the ZILOS. Fertil Steril 2003.
Fertility and Sterility  , DOI: ( /S (03) )

3. FIGURE 2
Photomicrograph of 10-cell human embryo after complete zona hatching with the laser (arrows mark outer margins of the defect). Original magnification, ×400.
Wong. Human embryo laser hatching using the ZILOS. Fertil Steril 2003.
Fertility and Sterility  , DOI: ( /S (03) )