Kim, S. ., Choi, D. ., Jang, I. ., Cha, B. ., Jost-Brinkmann, P. ., & Song, J. . (1969). Microbiologic changes in subgingival plaque before and during the early period of orthodontic treatment. The Angle Orthodontist. https://doi.org/10.2319/030311-156.1 (Original work published)