N. Bolong, A. F. Ismail, M. R. Salim, D. Rana, and T. Matsuura, “Surface Characterization by X–Ray Photoelectron Spectroscopy of Polyethersulfone Hollow Fiber Membranes Modified with Surface Modifying Macromolecules”, JAMST, vol. 11, no. 1, Nov. 2017.