@article{GraebGeidel2019,
  author    = {Patrick Gr{\"a}b and Ekkehard Geidel},
  title     = {Spectroscopic studies of food colorings},
  journal   = {World Journal of Chemical Education},
  volume    = {7},
  number    = {2},
  doi       = {10.12691/wjce-7-2-13},
  year      = {2019},
}