1. Clinical lectures on surgical disorders of bladder and prostate;Guyon,1888
2. Development and clinical significance of protrusion of hypertrophic prostate into the bladder observed by transrectal ultrasonotomography;Ohnishi;Nihon Hinyokika Gakkai Zasshi,1985
3. New concept of BPH: PCAR theory;Watanabe;Prostate,1998
4. Effects of bladder volume on transabdominal ultrasound measurements of intravesical prostatic protrusion and volume;Yuen;Int J Urol,2002
5. Correlation of intravesical prostatic protrusion with bladder outlet obstruction;Chia;BJU Int,2003