See, S., Levin, V. A., Yung, W. A., Hess, K. R., & Groves, M. D. (2004). 13-cis-Retinoic acid in the treatment of recurrent glioblastoma multiforme. Duke University Press.

See, Siew-Ju, Victor A. Levin, W.-K. Alfred Yung, Kenneth R. Hess, and Morris D. Groves. 13-cis-Retinoic Acid in the Treatment of Recurrent Glioblastoma Multiforme. Duke University Press, 2004.

See, Siew-Ju, et al. 13-cis-Retinoic Acid in the Treatment of Recurrent Glioblastoma Multiforme. Duke University Press, 2004.