1. Handbook of Heterogeneous Catalysis;Hatscher,2008
2. Handbook of Industrial Catalysis;Lloyd,2011
3. Ostwald W., British Patents 698 (1902), 8300 (1902), 7909 (1908); French Patent 317544 (1902); US Patent 858904 (1902).
4. Kaiser K., German Patent 271517 (1909); British Patents 20325 (1910); US Patent 987375 (1911).