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2. G.L. Litvinov and V.N. Fridman, Approximate construction of rational approximants, C. R. Acad. Bulgare Sci., 36, No. 1 (1981), 49–52 (in Russian).
3. I.A. Andreeva, G. L. Litvinov, A. Ya. Rodionov and V. N. Fridman, The PADE-program for Calculation of Rational Approximants. The Program Specification and its Code, Fond Algoritmov i Programm NIVTs AN SSSR, Puschino, 1985. (in Russian).
4. A.P. Kryukov, G.L. Litvinov and A.Ya. Rodionov, Construction of rational approximations by means of REDUCE, in: Proceeding of the ACM-SIGSAM Symposium on Symbolic and Algebraic Computation (SYMSAC 86), Univ. of Waterloo, Canada, 1986, pp. 31–33.
5. G.L. Litvinov, Approximate construction of rational approximations and an effect of error autocorrection, in: Mathematics and Modeling, NIVTs AN SSSR, Puschino, 1990, 99–141 (in Russian)