@article{BalkBehlLendlein2019,
  author    = {Maria Balk and Marc Behl and Andreas Lendlein},
  title     = {Quadruple-shape hydrogels},
  journal   = {Smart materials and structures},
  volume    = {28},
  number    = {5},
  doi       = {10.1088/1361-665X/ab0e91},
  year      = {2019},
}