@inproceedings{Maciula:2016Rm,
  author = "Maciula, Rafal",
  title = "{Production of c bar c c bar c in single and double parton scattering in collinear and k_t-factorization approaches}",
  doi = "10.22323/1.234.0500",
  booktitle = "Proceedings of The European Physical Society Conference on High Energy Physics {\textemdash} PoS(EPS-HEP2015)",
  year = 2016,
  volume = "234",
  pages = "500"
}