1. Nuzhin Ya. N., “Groups contained between groups of Lie type over various fields,” Algebra i Logika, 22,No. 5, 526–541 (1983).
2. Steinberg R., Lectures on Chevalley Groups [Russian translation], Mir, Moscow (1975).
3. Suzuki K., “On parabolic subgroups of Chevalley groups over local rings,” Tôhoku Math. J., 29,No. 1, 57–66 (1976).
4. Levchuk V. M., “Parabolic subgroups of certain ABA-groups,” Math. Notes, 31,No. 4, 259–267 (1982).
5. Nuzhin Ya. N. and Yakushevich A. V., “Intermediate subgroups of Chevalley groups over a field of fractions of a ring of principal ideals,” Algebra and Logic, 39,No. 3, 199–206 (2000).