To cite ddalpha in publications use:

Pokotylo, O., Mozharovskyi, P., and Dyckerhoff, R. (2016). Depth and depth-based classification with R-package ddalpha arXiv:1608.04109

Corresponding BibTeX entry:

  @Article{,
    title = {Depth and depth-based classification with R-package
      ddalpha},
    author = {Oleksii Pokotylo and Pavlo Mozharovskyi and Rainer
      Dyckerhoff},
    journal = {arXiv:1608.04109},
    year = {2016},
  }