Source: https://www.researchgate.net/profile/Haithem_Boumediri/publication/334106577_Extraction_and_characterization_of_vascular_bundle_and_fiber_strand_from_date_palm_rachis_as_potential_bio-reinforcement_in_composite/links/5dfc7eeca6fdcc28372ef510/Extraction-and-characterization-of-vascular-bundle-and-fiber-strand-from-date-palm-rachis-as-potential-bio-reinforcement-in-composite.pdf