Bombieri, E. (1980). "Thompson's problem σ2=3. Appendices by A. Odlyzko and D. Hunt". Invent. Math. 58 (1): 77–100. doi:10.1007/bf01402275. S2CID122867511. (This paper completed a line of research initiated by the Walter theorem.)
Bombieri, E. (1980). "Thompson's problem σ2=3. Appendices by A. Odlyzko and D. Hunt". Invent. Math. 58 (1): 77–100. doi:10.1007/bf01402275. S2CID122867511. (This paper completed a line of research initiated by the Walter theorem.)