1. A Study of Rock Hardness and Tunnel Boring Machine Advance Rates in Manhattan Schist;Dietl;Tunneling Technology Newsletter,1973
2. Étude de la Dureté des Roches et des Vitesses d'Avancement d'Une Machine Foreuse dans les Schistes de Manhattan;Dietl;Tunnels et Ouverages Souterrains,1974
3. McCusker, T.G. & Dietl, B.: Small Diameter Tunnels in Manhattan Schist. Proceedings, 2nd RETC, pp. 265-282. AIME, San Francisco, 1974.
4. McCusker, T.G. & Almgren, G.: Mechanical Boring or Drill & Blast Tunnelling. First US-Swedish Underground Workshop. Stockholm, December 5-10, 1976.
5. NTH: Hard Rock Tunnel Boring. Project Report 1-94.