To cite the 'specs' package in publications use:

Smeekes S, Wijler E (2020). “An automated approach towards sparse single-equation cointegration modelling.” Journal of Econometrics, 221(1), 247–276.

Corresponding BibTeX entry:

  @Article{,
    title = {An automated approach towards sparse single-equation
      cointegration modelling},
    author = {Stephan Smeekes and Etienne Wijler},
    journal = {Journal of Econometrics},
    year = {2020},
    volume = {221},
    number = {1},
    pages = {247--276},
    publisher = {Elsevier},
  }