1. Bergman, C.: Universal Algebra. Fundamentals and Selected Topics, Pure and Applied Mathematics, vol. 301. CRC Press, Boca Raton (2012)
2. Bergman, C.: Notes on quasivarieties and Maltsev products (2014). https://faculty.sites.iastate.edu/cbergman/files/inline-files/maltsevprods.pdf. Accessed Feb 2020
3. Burris, S., Sankappanavar, H.P.: A Course in Universal Algebra. Springer, New York (1981). http://www.math.uwaterloo.ca/~snburris/htdocs/ualg.html. Accessed Feb 2020
4. Freese, R., McKenzie, R.: Maltsev families of varieties closed under join or Maltsev product. Algebra Univers. 77(1), 29–50 (2017). https://doi.org/10.1007/s00012-016-0420-1
5. Kearnes, K.A., Tschantz, S.T.: Automorphism groups of squares and of free algebras. Int. J. Algebra Comput. 17(3), 461–505 (2007). https://doi.org/10.1142/S0218196707003615