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. (This paper completed a line of research initiated by the Walter theorem.)
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«Enrico Bombieri». Institute for Advanced Study (στα Αγγλικά). Ανακτήθηκε στις 7 Αυγούστου 2019.
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. (This paper completed a line of research initiated by the Walter theorem.)
