Nunes, P. S., Jesus, D. C., Bezerra, M. S., Souza, J. C. C., Silva, F. A., Serafini, M. R., … Araújo, A. A. de S. (2015). Validation of a UV-VIS Spectrophotometric method for the determination of usnic acid /collagen-based membranes. Scientia Plena, 11(9). https://doi.org/10.14808/sci.plena.2015.094501