Source: http://www.univ-bejaia.dz/jspui/bitstream/123456789/6576/1/Contribution%20%C3%A0%20l%E2%80%99%C3%A9tude%20des%20propri%C3%A9t%C3%A9s%20physico-%20m%C3%A9caniques%20des%20pl%C3%A2tres%20a%20et%20B%20avec%20l%E2%80%99ajout%20des%20fibres%20et%20de%20super%20plastifiant.CETIM-%20Boumerdesse..pdf