Araújo, P.N., Guimarães, A.L.A., Moura, M.R.L., Vieira, A.C.D.M., 2021. Quality control of commercial samples of "arnica" (Arnica montana and Solidago chilensis) from Rio de Janeiro, Brazil 13.. https://doi.org/10.18406/2316-1817v13n120211561