1. L. A. ANDERSON & W. GAUTSCHI, "Optimal weighted Chebyshev-type quadrature formulas" (To be published.)
2. S. BERNSTEIN, "Sur un système d’équations indéterminées," J. Math. Pures Appl., v. 17, 1938, pp. 179-186.
3. Sulla non esistenza di certe formule di quadratura;Gatteschi, Luigi;Univ. e Politec. Torino Rend. Sem. Mat.,1964
4. Mechanical quadratures with equal coefficients for the integrals ∫^{∞}₀ 𝑒^{-𝑥}𝑓(𝑥)𝑑𝑥 and ∫_{-∞}𝑒^{-𝑥²}𝑓(𝑥)𝑑𝑥;Krylov, V. I.;Dokl. Akad. Nauk BSSR,1955
5. Equally weighted quadrature formulas over semi-infinite and infinite intervals;Salzer, Herbert E.;J. Math. and Phys.,1955