Sobczak, M., et al. “Determination of Residual Tin in Synthesized Aliphatic Biomedical Polyesters by Electrothermal Atomic Absorption Spectroscopy”. Polimery, vol. 55, no. 9, Sept. 2010, pp. 674-80, https://polimery.ichp.vot.pl/index.php/p/article/view/1054.