1. T. Hongu and G. O. Phillips in“New Fibers”, p.3, Woodhead Publishing, Cambridge, 1997.
2. T. Hongu, G. O. Phillips, and M. Takigami in “New Millennium Fibers”, pp.2–7, Woodhead Publishing, Cambridge, 2000.
3. T. Hongu and G. O. Phillips in “New Fibers”, p.14, Woodhead Publishing, Cambridge, 1997.
4. Y. Washino in “Functional Fibers, Trends in Technology and Product Development in Japan”, pp.105–106, Toray Research Center Inc., Shiga, 1993.
5. I. S. Han and C. B. Lee, Fiber Technology and Industry, 10, 339 (2006).