1. Markusova, V.A., Poisk, 2003, no. 3 (713), p. 12.
2. Sadovnichii, V.A., Vasenin, V.A., Mokrousov, A.A., and Tutubalin, A.V., Rossiiskii Internet v tsifrakh i faktakh (Russian Internet in Facts and Figures), Moscow: Mosk. Gos. Univ., 1999.
3. Śilhánek, J. and Novotná, M., Chem. Listy, 1995, vol. 89, no. 1, p. 1.
4. Heller, S.R., J. Chem. Inf. Comp. Sci., 1996, vol. 36, no. 2, p. 205.
5. Packam, A.J., Trends Anal. Chem., 1996, vol. 15, no. 7, p. 257.