Pérez, M., G. Ramírez, M. Pérez, and P. Restrepo. “Validation of an Analytical Method for the Determination of Valsartan in Human Plasma by HPLC/UV With Addition Standard Using Losartan As an Internal Standard”. Colombia Medica, vol. 38, no. 1, Mar. 2007, pp. 13-20, doi:10.25100/cm.v38i1.469.