van der Meij, E. H., Schepman, K. P., Smeele, L. E., van der Wal, J. E., & van der Waal, I. (1999). A review of the recent literature regarding malignant transformation of oral lichen planus. Oral Surgery Oral Medicine Oral Pathology Oral Radiology and Endodontology, 88, 307-310.