To cite spNetwork for NKDE in publications use: To cite spNetwork as a
package use:

  Gelb Jérémy (2021). spNetwork, a package for network kernel density
  estimation. The R Journal.
  https://journal.r-project.org/archive/2021/RJ-2021-102/index.html.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {spNetwork, a package for network kernel density estimation},
    author = {Jérémy Gelb},
    journal = {The R Journal},
    year = {2021},
    url = {https://journal.r-project.org/archive/2021/RJ-2021-102/index.html},
    doi = {10.32614/RJ-2021-102},
  }

  Gelb Jérémy (2021). spNetwork: Spatial Analysis on Network.
  https://jeremygelb.github.io/spNetwork/.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {spNetwork: Spatial Analysis on Network},
    author = {Jérémy Gelb},
    year = {2021},
    url = {https://jeremygelb.github.io/spNetwork/},
  }