Source: http://www.univ-bejaia.dz/jspui/bitstream/123456789/9426/1/Conception%20et%20r%C3%A9alisation%20d%27un%20compteur%20d%27%C3%A9nergie%20%C3%A9lectrique%20consultable%20%C3%A0%20distance%20et%20acc%C3%A8s%20local%20par%20carte%20%C3%A0%20puce..pdf