1. V. V. Zudilin, “Algebraic relations for multiple zeta values,” Uspekhi Mat. Nauk [Russian Math. Surveys], 58 (2003), no. 1, 3–32.
2. E. A. Ulanskii, “Identities for generalized polylogarithms,” Mat. Zametki [Math. Notes], 73 (2003), no. 4, 613–624.
3. V. N. Sorokin, “On Apery's theorem,” Vestnik Moskov. Univ. Ser. I Mat. Mekh. [Moscow Univ. Math. Bull.] (1998), no. 3, 48–53.
4. V. N. Sorokin, “On the degree of transcendency of the number π2,” Mat. Sb. [Russian Acad. Sci. Sb. Math.], 187 (1996), no. 12, 87–120.
5. Yu. V. Nesterenko, “Integral identities and constructions for joint approximations to the values of of the Riemann zeta function,” in: Proceedings of the IV International Conference “Problems of Current Interest in Number Theory and Its Applications” (Tula, 2001) [in Russian], Izd. Moskov. Univ., Moscow, 2002, pp. 115–132.