1. A continuous quality control program for strict sperm morphology
Daniel R Franken, Ph.D., Regula Barendsen Clin. Med. Tech, Thinus F Kruger, M.D. 
Fertility and Sterility 
Volume 74, Issue 4, Pages (October 2000)
DOI: /S (00)

2. Figure 1
Comparison between the mean percentage of normal forms recorded by the reference laboratory (open columns) and that of the participating laboratories (shaded columns).
Franken. CQC program for sperm morphology. Fertil Steril 2000.
Fertility and Sterility  , DOI: ( /S (00) )

3. Figure 2
The mean percentage difference recorded for six slides between the reference and the nine participating laboratories.
Franken. CQC program for sperm morphology. Fertil Steril 2000.
Fertility and Sterility  , DOI: ( /S (00) )