1. I. I. Gel’perin and A. M. Kagan, Vessels with Fixed Granular Beds. Information Review. Series on the Nitrogen Industry [in Russian], Nauchno-Issledovatel’skii Institut Tekhniko-Ékonomicheskikh Issledovanii po Khimii, Moscow (1978), pp. 2–16.
2. M. Leva, “Correlations in fixed-bed systems,” Chem. Engin., 64, No. 9, 245–248 (1957).
3. N. M. Zhavoronkov, M. É. Arov, and N. N. Umnik, “Hydraulic resistance and packing density of a granular bed,” Zh. Fiz. Khim., 23, No. 3, 342–360 (1949).
4. E. D. Zavelev, V. P. Semenov, et al., “Effect of geometric parameters of a granular bed of catalyst granules on porosity,” Chemistry and Technology of Nitrogen Fertilizers. Production of Synthesis Gas and Ammonia, Gos. Nauchno-Issled. Proekt. Inst. Azotnoi Prom. Produk. Organ. Sinteza, No. 41, 24–30 (1976).
5. M. É. Arov, E. D. Zavelev, et al., “Some laws governing formation of fixed granular beds,” Reference Handbook; Nitrogen Industry [in Russian] (1978), pp. 24–31.