To cite exuber in publications use:

Vasilopoulos K, Pavlidis E, Martínez-García E (2022). “exuber: Recursive Right-Tailed Unit Root Testing with R.” Journal of Statistical Software, 103(10), 1–26. doi:10.18637/jss.v103.i10.

Corresponding BibTeX entry:

  @Article{,
    title = {{exuber}: Recursive Right-Tailed Unit Root Testing with
      {R}},
    author = {Kostas Vasilopoulos and Efthymios Pavlidis and Enrique
      Mart{\'i}nez-Garc{\'i}a},
    journal = {Journal of Statistical Software},
    year = {2022},
    volume = {103},
    number = {10},
    pages = {1--26},
    doi = {10.18637/jss.v103.i10},
  }