@article{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",
  journal = "PoS",
  year = 2013,
  volume = "DIS 2013",
  pages = "293"
}