1. Theorems implying the non-vanishing of ∑ χ(m)m−1 for real residue-characters;Bateman;J. Indian Math. Soc. (N.S.),1959
2. Limitazioni riguardanti somme di caratteri reali e somme di funzioni completamente multiplicative;Bombieri;Ist. Lombardo Accad. Sci. Lett. Rend.,1960
3. The explicit formula for L0(x);Fawaz,1951
4. On an elementary approach to some problems from the field of the distribution of prime numbers;Gelfond;Vestnik Moskov. Univ. Ser. Fiz.-Mat. Estest. Nauk,1953
5. On a result of E. Bombieri concerning Dirichlet's L-functions;Goldsmith;Ist. Lombardo Accad. Sci. Lett. Rend.,1965