@inproceedings{Maciula:2013uU,
  author = "Maciula, Rafal",
  title = "{Production of two $c \bar c$ pairs in double-parton scattering within $k_{t}$-factorization approach}",
  doi = "10.22323/1.191.0293",
  booktitle = "Proceedings of XXI International Workshop on Deep-Inelastic Scattering and Related Subjects {\textemdash} PoS(DIS 2013)",
  year = 2013,
  volume = "191",
  pages = "293"
}