@article{fukushima_2014, 
  title={PROLATE SPHEROIDAL HARMONIC EXPANSION OF GRAVITATIONAL FIELD}, 
  volume={147}, 
  DOI={10.1088/0004-6256/147/6/152}, 
  publisher={IOP Publishing}, 
  author={Fukushima}, 
  year={2014}, 
  month={May}
  }