V. E. Zoteev, E. D. Stukalova, E. V. Bashkinova, “Numerical method of estimation of parameters
of the nonlinear differential operator of the second order”, Vestn. Samar. Gos. Tekhn. Univ., Ser. Fiz.-Mat. Nauki [J. Samara State Tech. Univ., Ser. Phys. Math. Sci.], 21:3 (2017), 556–580
