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3. N. N. Bambalov, “Isolation of Lignin Preparations from Humified Materials and Their Properties,” Pochvovedenie, No. 5, 549–556 (2001) [Eur. Soil Sci. 34 (5), 484–491 (2001)].
4. N. N. Bambalov, “The Lignin Content in Virgin and Cultivated Peat Soils of Belarussian Poles’e,” Pochvovedenie, No. 11, 1316–1322 (2007) [Eur. Soil Sci. 40 (11), 1175–1180 (2007)].
5. G. Brunov, “Structure and Reactions of Lignin,” in Wood Chemistry (Lesnaya promyshlennost’, Moscow, 1982), pp. 153–171 [in Russian].