1. Mal’tsev A. I., “Structure characterization of some classes of algebras,” Dokl. Akad. Nauk SSSR, 120, No. 1, 29–32 (1958).
2. Pinus A. G., “On conditional terms and identities on universal algebras,” Vychisl. Sistemy, 156, 59–78 (1996).
3. Pinus A. G., “Inner homomorphisms and positively conditional terms,” Algebra and Logic, 40, No. 2, 87–95 (2001).
4. Pinus A. G., Conditional Terms and Their Applications to Algebra and the Theory of Computations [in Russian], Izdat. NGTU, Novosibirsk (2002).
5. Pinus A. G., “Conditional terms and their applications in algebra and computation theory,” Russian Math. Surveys, 56, No. 4, 649–686 (2001).