Ergin Kosa and  Ali Göksenli,  Effect of Impact Angle on Erosive Abrasive Wear of Ductile and Brittle Materials.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2015, vol. 105(9). 1638 - 1642
    [viewed 28 February 2020]. Available from: https://publications.waset.org/pdf/10002428.