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2. Bakhvalov, N.S.: On the optimality of linear methods for operator approximation in convex classes of functions (in Russian). Zh. Vychisl. Mat. Mat. Fiz.11, 1014–1018 (1971). (English Transl.): U.S.S.R. Comput. Math. Math. Phys.11, 244–249 (1971)
3. Barnhill, R.E.: Asymptotic properties of minimum norm and optimal quadratures. Numer. Math.12, 384–393 (1968)
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