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2. Fehlerabscätzung für das Differenzenverfahren zur Lösung partieller Differentialgleichungen;Gerschgorin;Zeits. f. angew. Math. u. Mech.,1930
3. On discrete harmonic functions;Heilbronn;Proc. Camb. Phil. Soc.,1949
4. The theory of approximation;Jackson;Amer. Math. Soc. Coll. Pub.,1930
5. Fourier series and orthogonal polynomials;Jackson;Mathematical Association of America Carus Monograph,1941