Pérez López, E., E. Barrantes Barrantes, and R. Villalobos Landazuri. “Two Methods for the Quantification of Paraquat in Soluble Concentrate Pesticides”. UNED Research Journal, vol. 12, no. 2, Oct. 2020, p. e3042, doi:10.22458/urj.v12i2.3042.