@article{santos1982,
  author  = {Santos, Ashraf and Fischer, Hiroshi},
  title   = {Modelling Phase-Locked Loops with Photoelastic Stress Analysis},
  journal = {Open Access Journal of Engineering Applications},
  year    = {1982},
  volume  = {6},
  number  = {1},
  pages   = {101-112},
  issn    = {3105-7004},
  doi     = {10.55555/oajea.1982.0601.006},
  url     = {https://journal.bsaps.com/article/5873}
}