@article{toh_wright_mitcheson_2014, 
  title={Resonant frequency tuning of an industrial vibration energy harvester}, 
  volume={557}, 
  DOI={10.1088/1742-6596/557/1/012128}, 
  publisher={IOP Publishing}, 
  author={Toh and Wright and Mitcheson}, 
  year={2014}, 
  month={Nov}
  }