1. J. C. Bertolini, J. Massardier (Hydrocarbons on Metals, in: D. A. King, D. P. Woodruff, The Chemical Physics of Solid Surfaces and Heterogeneous Catalysis, Vol. 3, Elsevier, Amsterdam — Oxford — New York 1984, pp. 107/36).
2. G. W. Orton (Trans. AIME 230 [1964] 600/2).
3. P. Schwarzkopf, R. Kieffer, W. Lescynski, F. Benesovsky (Refractory Hard Metals, New York 1953, pp. 1/447, 139/43).
4. E. K. Storms (The Refractory Carbides, Academic, New York 1967, pp. 143/54,144,153).
5. V. I. Alekseev, L. A. Shvartsman (Izv. Akad. NaukSSSR Met. Gorn. Delo 1963 No. 1, pp. 91/6 from E. K. Storms [3]; Russ. Met. Mining 1963 No. 1, p. 41, abstract only translated).