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3. A. N. Izmailov and V. P. Shunkov, "On groups with the conjugately biprimitive finiteness condition," in: Sixteenth All-Union Algebra Conference, Part 1, Leningrad (1981), pp. 60–61.
4. A. N. Izmailov and V. P. Shunkov, "On a criterion for the nonsimplicity of periodic groups with an infinitely isolated subgroup," in: Eighth All-Union Symposium on Group Theory, Kiev (1982), pp. 43–44.
5. A. N. Izmailov and V. P. Shunkov, "On periodic groups with a strongly imbedded infinitely isolated subgroup," in: Seventeenth All-Union Algebra Conference, Part 2, Minsk (1983), pp. 86–87.