Source: https://www.researchgate.net/profile/Ahmed_Belaadi2/publication/344402566_Improving_The_Mechanical_Performance_of_biocomposite_Plaster_Washingtonian_filifira_Fibres_Using_the_RSM_Method/links/5f71d327299bf1b53efa5a4f/Improving-The-Mechanical-Performance-of-biocomposite-Plaster-Washingtonian-filifira-Fibres-Using-the-RSM-Method.pdf