Lotufo, M. A., Júnior, C. A. L., Shimizu, M. T., Cabral, R., & Birman, E. G. (2010). Clinical evaluation of the topical use of propolis in recurrent minor aphthous ulceration. Brazilian Dental Science, 8(3). https://doi.org/10.14295/bds.2005.v8i3.327