@article{PereraBoeckmann2020,
  author    = {Upeksha Perera and Christine B{\"o}ckmann},
  title     = {Solutions of Sturm-Liouville problems},
  journal   = {Mathematics},
  volume    = {8},
  number    = {11},
  doi       = {10.3390/math8112074},
  year      = {2020},
}