N. shaban Mustafa, M. A. Kashmoola, M. ZulhelmiBaharudin, H. I. Hashim, O. A. Jabbar, and B. E. M. Alahmad, “A pilot study on the use of biolase in the treatment of recurrent aphthous ulcer”, Braz. J. Oral Sci., vol. 17, p. e18464, Nov. 2018.