To cite lagsarlmtree in publications use:

Wagner M, Zeileis A (2019). “Heterogeneity and Spatial Dependence of Regional Growth in the EU: A Recursive Partitioning Approach.” German Economic Review, 20(1), 67–82. doi:10.1111/geer.12146.

Corresponding BibTeX entry:

  @Article{,
    title = {Heterogeneity and Spatial Dependence of Regional Growth in
      the {EU}: A Recursive Partitioning Approach},
    author = {Martin Wagner and Achim Zeileis},
    journal = {German Economic Review},
    year = {2019},
    volume = {20},
    number = {1},
    pages = {67--82},
    doi = {10.1111/geer.12146},
  }