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- [8] THE APPROXIMATION OF DIFFERENTIABLE FUNCTIONS BY LAGRANGE INTERPOLATION POLYNOMIALS IN TSCHEBYSCHEV KNOTS DOKLADY AKADEMII NAUK SSSR, 1981, 261 (03): : 527 - 530
- [9] APPROXIMATION OF WEAK TSCHEBYSCHEV SYSTEM BY TSCHEBYSCHEV SYSTEMS VESTNIK LENINGRADSKOGO UNIVERSITETA SERIYA MATEMATIKA MEKHANIKA ASTRONOMIYA, 1981, (02): : 117 - 119