1. The converse of Abel's theorem on power series;Littlewood,1911
2. Contributions to the arithmetic theory of series;Hardy,1913
3. Einige Ungleichungen für zweimal differenzierbare Funktionen;Landau,1914
4. The elementary cases of Landau's problem of inequalities between derivatives;Schoenberg;Amer. Math. Montly,1973
5. Distributions, an Outline;Marchand,1962