To cite testassay in publications use:

Fay, P. M, Sachs, C. M, Miura, K. (2018). “Measuring precision in bioassays: Rethinking assay validation.” Statistics in Medicine, 37(4), 519–529. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5771887/.

Corresponding BibTeX entry:

  @Article{,
    title = {Measuring precision in bioassays: Rethinking assay
      validation},
    author = {{Fay} and M. P. and {Sachs} and M. C. and {Miura} and
      {K.}},
    journal = {Statistics in Medicine},
    year = {2018},
    volume = {37},
    number = {4},
    pages = {519--529},
    url = {https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5771887/},
  }