To cite package ‘einsum’ in publications use:

Ahlmann-Eltze C (2023). einsum: Einstein Summation. R package version 0.1.2, https://github.com/const-ae/einsum.

Corresponding BibTeX entry:

  @Manual{,
    title = {einsum: Einstein Summation},
    author = {Constantin Ahlmann-Eltze},
    year = {2023},
    note = {R package version 0.1.2},
    url = {https://github.com/const-ae/einsum},
  }