To cite package ‘filematrix’ in publications use:

Shabalin A (2019). filematrix: File-Backed Matrix Class with Convenient Read and Write Access. R package version 1.3, https://github.com/andreyshabalin/filematrix.

Corresponding BibTeX entry:

  @Manual{,
    title = {filematrix: File-Backed Matrix Class with Convenient Read
      and Write Access},
    author = {Andrey A Shabalin},
    year = {2019},
    note = {R package version 1.3},
    url = {https://github.com/andreyshabalin/filematrix},
  }