1. Ashton-Miller, J.A., DeLancey, J.O.L., Warwick, D.N., 2002. Method and Apparatus for Measuring Properties of the Pelvic Floor Muscles, US Patent # 6,468,232 B1, October 2002
2. Measuring agreement in method comparison studies;Bland;Stat. Methods Med. Res.,1999
3. Vaginal palpation of pelvic floor muscle strength: inter-test reproducibility and comparison between palpation and vaginal squeeze pressure;Bö;Acta Obstet. Gynecol. Scand.,2001
4. A digital test for pelvic muscle strength in older women with urinary incontinence;Brink;Nurs. Res.,1989
5. A digital test for pelvic muscle strength in women with urinary incontinence;Brink;Nurs. Res.,1994