1. Methoden der mathematischen Physik II;Courant,1937
2. Les espaces du type de Beppo Levi;Deny;Ann. Inst. Fourier,1953
3. Abelian Groups;Fuchs,1958
4. Extremal Length and Closed Extensions of Partial Differential Operators;Fuglede,1960
5. Theory of Bessel Functions;Watson,1945