Hilal, N., Zafisah, N. S., Ang, W. L., Mohammad, A. W., & Johnson, D. (2020). Interaction between ballasting agent and flocs in ballasted flocculation for the removal of suspended solids in water. Journal of Water Process Engineering, 33, p. 101028. doi:10.1016/j.jwpe.2019.101028

Hilal, Nidal, Nurul Syahidah Zafisah, Wei Lun Ang, Abdul Wahab Mohammad, and Daniel Johnson. "Interaction between Ballasting Agent and Flocs in Ballasted Flocculation for the Removal of Suspended Solids in Water." Journal of Water Process Engineering 33 (2020): 101028.

Hilal, Nidal, et al. "Interaction between Ballasting Agent and Flocs in Ballasted Flocculation for the Removal of Suspended Solids in Water." Journal of Water Process Engineering 33 (2020): 101028.