1. S. E. Manahan , in Environmental Chemistry, CRC Press, London, 1994
2. Registry of Toxic Effects of Chemical Substances, ed. R. J. Lewis Snr. and R. L. Tatken, U.S. Dept. of Health and Human Services, Cincinnati, Ohio, USA, 1980, vol. 1, p. 763
3. Mixed Co–Zn–Al oxides as absorbents for low-temperature gas desulfurisation