@article{caldwell2016path,
  author = {Caldwell, A. and Biskup, B. and Gschwendtner, E.},
  title = {Path to {AWAKE}: Evolution of the concept},
  journal = {Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment},
  publisher = {Elsevier BV},
  volume = {829},
  pages = {3--16},
  year = {2016},
  doi = {10.1016/j.nima.2015.12.050},
  issn = {0168-9002}
}