1. Metody kolichestvennogo organicheskogo elementnogo mikroanaliza (Methods of Quantitative Organic Elemental Microanalysis) Gel’man, N.E., Ed., Moscow: Khimiya, 1987.
2. Al-Abachi, M.O., Microchem. J., 1986, vol. 33, no. 1, p. 34.
3. Walisch, W. and Humme, G., Mikrochim acta, 1968, no. 4, p. 748.
4. Chamberlain, B.A., Anal. Chim. Acta, 1971, vol. 57, no. 1, p. 81.
5. Burgasser, A.J., Singly, K., and Colarutolo, J.F., Anal. Chem., 1987, vol. 49, no. 13, p. 1977.