1. G. M. Derkacheva, ?Inventions abroad on friction powder materials (review),? Poroshk. Metall., No. 7, 93?98 (1983).
2. G. M. Derkacheva, ?Fundamental directions in the technology of production of friction powder materials abroad (review),? ibid., No. 10, 53 (1984).
3. V. A. Genkin, E. M. Komarov, and E. I. Fishbein, ?Authors' cert. 954487 USSR. An ironbase sintered friction material,? Otkryt. Izobr., No. 32, 83 (1982).
4. V. A. Genkin, E. M. Komarov, E. I. Fishbein, and L. M. Shmagin, ?Authors' cert. 954496 USSR. An iron-base sintered friction material,? ibid., 84.
5. A. N. Nazaryan, A. A. Andreasyan, K. A. Torosyan, and L. A. Épiazyan, ?Authors' cert. 1081231 USSR. An iron-base sintered friction material,? ibid., No. 11 92 (1984).