1. Mechanical quadrature formulas for multiple integrals with a minimal number of terms;Georgiev, G.;Doklady Akad. Nauk SSSR (N.S.),1952
2. Formulas of mechanical quadratures with equal coefficients for multiple integrals;Georgiev, G.;Doklady Akad. Nauk SSSR (N.S.),1953
3. Mechanical quadratures with a minimal number of terms;Georgěv, Georg;Rozprawy Mat.,1955
4. Numerical evaluation of multiple integrals. II;Hammer, Preston C.;Math. Tables Aids Comput.,1958
5. C. C. MacDuffee, Theory of Matrices, Chelsea, New York, 1946.