To cite spict in publications, please use:

  Pedersen, M. W. and Berg, C. W. (2017), A stochastic surplus
  production model in continuous time. Fish and Fisheries, 18(2):
  226-243. doi:10.1111/faf.12174

A BibTeX entry for LaTeX users is

  @Article{,
    title = {A stochastic surplus production model in continuous time},
    author = {Martin W. Pedersen and Casper W. Berg},
    doi = {10.1111/faf.12174},
    year = {2017},
    journal = {Fish and Fisheries},
    volume = {18},
    number = {2},
    pages = {226-243},
  }