1. S. Bengtsson and L. Fordén, “Rolling Contact Fatigue Tests of Selectively Densified Materials”, Proceedings P/M2. Tech World Congress 2001, New Orleans, LO, pp. 10/71-10/86, (2001)
2. “Suitability of high density powder metal gears for gear application”;Link;Gear Technology,2001
3. S. Bengtsson, L. Fordén, S. Dizdar, and P. Johansson, “Surface Densified P/M Transmission Gear”, 2001 International Conference on Power Transmission Components. Advances in High Performance Powder Metallurgy Applications, Ypsilanti MI, October 16–17, pp. 1–25, (2001)
4. “Rolling Contact Fatigue Properties of DensiForm® P/M Alloys”;Nigarura,2001
5. Ch. Sandner, R. Ratzi, B. Lorenz, and T. Tobie, “Sintered Gears – Achievable Load-Carrying Capacities by Conventional and New Production Methods”, VDI-Report Nr. 1665, VDI-Verlag Düsseldorf, (2002)