Campos, N.V., Azevedo, A.A. and Sant'Anna-Santos, B.F. (2011) “Fluorine accumulation and its phytotoxic effects in blue coleus and lemongrass leaves used for tea”, Pesquisa Agropecuaria Brasileira, 45(7), pp. 646–653. doi:10.1590/S1678-3921.pab2010.v45.7903.