diffcyt is described in the following publication:

  Weber et al. (2019), diffcyt: Differential discovery in
  high-dimensional cytometry via high-resolution clustering,
  Communications Biology, 2, 183.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {diffcyt: Differential discovery in high-dimensional cytometry via high-resolution clustering},
    author = {Lukas M. Weber and Malgorzata Nowicka and Charlotte Soneson and Mark D. Robinson},
    journal = {Communications Biology},
    year = {2019},
    volume = {2},
    number = {183},
    doi = {https://doi.org/10.1038/s42003-019-0415-5},
  }