To cite the gbmt package in publications use:

A. Magrini (2022). Assessment of agricultural sustainability in European Union countries: A group-based multivariate trajectory approach. AStA Advances in Statistical Analysis, 106, 673-703.<doi:10.1007/s10182-022-00437-9>

Corresponding BibTeX entry:

  @Article{,
    title = {Assessment of agricultural sustainability in European
      Union countries: A group-based multivariate trajectory approach},
    author = {Alessandro Magrini},
    journal = {AStA Advances in Statistical Analysis},
    year = {2022},
    volume = {106},
    pages = {673--703},
    doi = {10.1007/s10182-022-00437-9},
  }