1. Inequalities.;Hardy,1952
2. Real and abstract analysis.;Hewitt,1965
3. The analysis of linear partial differential operators I.;HÖRMANDER,1983
4. The boundary problem of an ordinary linear differential system in the complex domain.;Langer;Trans. Amer. Math. Soc.,1939
5. Introduction to the theory of Fourier integrals.;TlTCHMARSH,1948