“O-PHTHALALDEHYDE AS A DERIV ATISING REAGENT FOR THE SPECTROPHOTOMETRIC DETERMINATION OF AMINES AND AMINO ACIDS”. Biological Sciences - PJSIR, vol. 37, no. 10, June 2022, pp. 408-10, https://biostaging.pjsir.org/index.php/biological-sciences/article/view/2731.