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2. M. D. Ramazanov, Theory of lattice cubature formulas with a limited boundary layer. (Ufa: Design Polygraph Service, 2009) p. 178.
3. S. L. Sobolev, “Coefficients of optimal quadrature formulas.” Reports of AS USSR. 1(235), 34–37 (1977).
4. S. L. Sobolev and V. L. Vaskevich, Cubature formulas. (Novosibirsk: IM RAN, 1996) p. 414.
5. Best Approximate Integration Formulas; Best Approximation Formulas