Nirmal, Umar and Hashim, Jamil and Megat Ahmad, M. M. H. and Yuhazri, M. Y. (2018) Surface Roughness Analysis of Stainless Steel Counterface (AISI-304) Subjected to Treated Betelnut Fiber–Reinforced Polyester (T-BFRP) Composites Aged in Different Solutions with Different Kinematic Viscosity. Materials Performance and Characterization, 7 (3). p. 20170085. ISSN 23791365

Nirmal, Umar and Hashim, Jamil (2015) A review on tribological performance of natural fibre polymeric composites. Tribology International, 83. pp. 77-104. ISSN 0301-679X

Nirmal, Umar and Hashim, Jamil and Low, K.O. (2012) Adhesive wear and frictional performance of bamboo fibres reinforced epoxy composite. Tribology International, 47. pp. 122-133. ISSN 0301679X