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http://www.ict.kth.se/MAP/FMI/Negonet/tgn-ons/documents/Energy%20efficiency%20in%20Access%20networks/bm-sbrc11-tutorial-1june11.pdf
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http://www.itu.int/rec/T-REC-G.Sup45-200905-I/en
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http://www.ieee802.org/3/av/public/2008_09/3av_0809_mandin_4.pdf
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http://www.itu.int/rec/T-REC-G.987/en