E. I. Isaev et al., Metallurgy and Coke-Chemistry, No. 7, Metallurgy of Steel, Republican Inter-Institute Sci-Tech. Symposium [in Russian], Tekhnika, Kiev (1967), p. 45.
A. Bungeroth and A. Scheufele, Berg und Hüttenmännische Monatshefte,107, No. 4, 76 (1962).
A. Kh. Kharbash et al., Inf. TsIIN ChM, No. 6, Seriya 10, 5 (1963).
F. Tomsu and V. Doležel, Hutnicke Listy,20, No. 2, 111 (1965).
D. P. Evteev et al., Ogneupory, No. 9, 43 (1969).