To cite mvgam in publications use:

  Clark & Wells (2022). Dynamic Generalized Additive Models (DGAMs) for
  forecasting discrete ecological time series. Methods in Ecology and
  Evolution, 14, 771-784. doi.org/10.1111/2041-210X.13974

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Dynamic Generalized Additive Models (DGAMs) for forecasting discrete ecological time series},
    author = {Nicholas J Clark and Konstans Wells},
    journal = {Methods in Ecology and Evolution},
    year = {2022},
    volume = {14},
    pages = {771-784},
    doi = {10.18637/jss.v100.i05},
    encoding = {UTF-8},
  }