1. Non-nullité des fonctions zéta des corps quadratiques réels pour 0<𝑠<1;Çallialp, Fethi;C. R. Acad. Sci. Paris S\'{e}r. A-B,1980
2. Some remarks on 𝐿-functions and class numbers;Chowla, S.;Acta Arith.,1975
3. On Epstein’s zeta-function;Selberg, Atle;J. Reine Angew. Math.,1967
4. The length of a period of quadratic irrationality;Golubeva, E. P.;Mat. Sb. (N.S.),1984
5. On Siegel’s zero;Goldfeld, D. M.;Ann. Scuola Norm. Sup. Pisa Cl. Sci. (4),1975