Huang, L., Gao, X., Liu, M., Du, G., & Guo, J. (2012). SO2 in Atmosphere Predicted with Improved Error GM (1,1) Model-Based on Optimization of Initial Condition in Chongqing, China. Asian Journal of Chemistry, 25(4), 2031–2034. https://doi.org/10.14233/ajchem.2013.13284