To cite LMMsolver in publications use:

Martin P. Boer (2023). Tensor product P-splines using a sparse mixed model formulation Statistical Modelling 23 465 - 479 URL https://doi.org/10.1177/1471082X231178591

Corresponding BibTeX entry:

  @Article{,
    title = {Tensor product {P}-splines using a sparse mixed model
      formulation},
    author = {{Martin P. Boer}},
    journal = {Statistical Modelling},
    year = {2023},
    volume = {23},
    number = {5-6},
    pages = {465 - 479},
    doi = {10.1177/1471082X231178591},
  }