Shaun Kaplan Daniel de Villiers Leon Steenkamp Gerhard de Jager Jevon Davies Richardt Wilkinson Towards power transformer condition monitoring. 323-324 2009 SenSys http://doi.acm.org/10.1145/1644038.1644082 conf/sensys/2009 db/conf/sensys/sensys2009.html#KaplanVSJDW09