Okada K.; Saito H.; Nishida J.; Miyakoshi N.; Takahashi S.; Nagasawa H.; Suzuki N.; Chida S. Discal Cyst Associated with Myxoid Change and Apoptosis of Herniated Disc Materials. Upsala Journal of Medical Sciences, v. 112, n. 1, p. 39–47, 12 Jul. 2009.