@article{Roundy2003vibrations,
  author = {Roundy and Wright and Rabaey},
  title = {A study of low level vibrations as a power source for wireless sensor nodes},
  journal = {Computer Communications},
  year = {2003},
  doi = {10.1016/S0140-3664(02)00248-7},
  url = {https://doi.org/10.1016/S0140-3664(02)00248-7}
}

@article{Beeby2006vibration,
  author = {Beeby and Tudor and White},
  title = {Energy harvesting vibration sources for microsystems applications},
  journal = {Measurement Science and Technology},
  year = {2006},
  doi = {10.1088/0957-0233/17/12/R01},
  url = {https://doi.org/10.1088/0957-0233/17/12/R01}
}