K. M. Bregman, “Differentiation algorithm based on the additional variables method”, Vestnik S.-Petersburg Univ. Ser. 10. Prikl. Mat. Inform. Prots. Upr., 2013, no. 2, 14–26
2012
2.
L. K. Babadzanjanz, K. M. Bregman, “Algorithm of the additional variables method”, Vestnik S.-Petersburg Univ. Ser. 10. Prikl. Mat. Inform. Prots. Upr., 2012, no. 2, 3–12