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Feng, X., Zhang, Y., Wang, G., Miao, M., & Shi, L. (2015). Dual-surface modification of calcium sulfate whisker with sodium hexametaphosphate/silica and use as new water-resistant reinforcing fillers in papermaking. Powder Technology, 271, 1–6. doi:10.1016/j.powtec.2014.11.015 
10.1016/j.powtec.2014.11.015