@article{PolzRobinsonKalininetal.2019,
  author    = {Jens Polz and Alexander P. L. Robinson and Anton Kalinin and Georg Alexander Becker and Rui Alexandre Costa Fraga and Marco Hellwing and Marco Hornung and Sebastian Keppler and Alexander Kessler and Diethard Kl{\"o}pfel and Hartmut Liebetrau and Frank Schorcht and Joachim Hein and Matth{\"a}us Zepf and Robert Evaristo Grisenti and Malte Christoph Kaluza},
  title     = {Efficient laser-driven proton acceleration from a cryogenic solid hydrogen target},
  journal   = {Scientific reports},
  volume    = {9},
  number    = {1, Art. 16534},
  pages     = {1 -- 8},
  doi       = {10.1038/s41598-019-52919-7},
  year      = {2019},
}