@article{BratengeierHolubyevWegener2019,
  author    = {Klaus Bratengeier and Kostyantyn Holubyev and Sonja Wegener},
  title     = {Steeper dose gradients resulting from reduced source to target distance—a planning system independent study},
  journal   = {Journal of Applied Clinical Medical Physics},
  volume    = {20},
  number    = {1},
  doi       = {10.1002/acm2.12490},
  year      = {2019},
}