1. Harris, J.A. Application of the Hair Diameter Index (HDI) in Obtaining a Target Hair Density. Poster presented at the 11th Annual Scientific Meeting of the International Society of Hair Restoration, New York, New York, October 2003.
2. Harris, J.A. Introduction of the Hair Volume Index (HVI) and Its Correlation to Subjective Visual Hair Density. Scientific Session presentation and poster presented at the 11th Annual Scientific Meeting of the International Society of Hair Restoration Surgery. New York, New York, October 2003.
3. Erdogan, K. Coverage Value and Graft Calculation. Presented at the World FUE Institute Meeting, 2015. https://youtu.be/O-gu9rJZhiY
4. Harris, J.A. Biodiversity of Hair Shaft Diameters: A Statistical Analysis. Poster presented at the 11th Annual Scientific Meeting of the International Society of Hair Restoration Surgery. New York, New York, October 2003.
5. Robbins, C.R. The Physical Properties of Hair Fibers. In: Chemical and Physical Behavior of Human Hair. Springer-Verlag Berlin Heidelberg, 2012; pp. 586, 597.