1. Powell's pearls: Jean Guillaume Auguste Lugol, MD (1788-1851);Powell;Obstet Gynecol Surv,2006
2. Biographic sketch: Powell's Pearls: Walter Schiller, MD (1887-1960);Powell;Obstet Gynecol Surv,2004
3. Schiller's test: an aid in esophagostopic diagnosis;Brodmerkel;Gastroenterology,1971
4. Early diagnosis of carcinoma of the cervix;Schiller;Surg Gynecol Obstet,1933
5. Iodine Test https://en.wikipedia.org/wiki/Iodine_test. Available at: https://en.wikipedia.org/w/index.php?title=Iodine_test&oldid=961160990. Accessed June 6, 2020.