To cite Trendy in publications use:

  Bacher R, Leng N, Ni Z, Chu LF, Thomson JA, Kendziorski C, Stewart
  RM, Trendy: segmented regression analysis of expression dynamics in
  high-throughput ordered profiling experiments. BMC Bioinformatics.
  2018 Dec;19(1):380.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Trendy: segmented regression analysis of expression dynamics in high-throughput ordered profiling experiments},
    author = {Rhonda Bacher and Ning Leng and Li-Fang Chu and Zijian Ni and James A. Thomson and Christina Kendziorski and Ron M. Stewart},
    journal = {BMC Bioinformatics},
    year = {2018},
    url = {https://bmcbioinformatics.biomedcentral.com/articles/10.1186/s12859-018-2405-x},
  }