1. V. M. Glushkov, “Some problems in the theories of automata and artificial intelligence,” Cybern. Syst. Analysis, Vol. 6, No. 2, 17–27 (1970). https://doi.org/10.1007/BF01070496.
2. A. Lyaletski, M. Morokhovets, and A. Paskevich, “Kyiv school of automated theorem proving: A historical chronicle,” in: Logic in Central and Eastern Europe: History, Science, and Discourse, University Press of America, Lanham (2012), pp. 431–469.
3. K. Vershinine and A. Paskevich, “ForTheL — the language of formal theories,” Intern. J. of Inform. Theories and Applications, Vol. 7, No. 3, 120–126 (2000).
4. V. M. Glushkov, Yu. V. Kapitonova, A. A. Letichevskii, K. P. Vershinin, and N. P. Malevanyi, “Construction of a practical formal language for mathematical theories,” Cybern. Syst. Analysis, Vol. 8, No. 5, 730–739 (1972). https://doi.org/10.1007/BF01068445.
5. Otter Homepage. URL: http://www.mcs.anl.gov/research/projects/other/.