To cite deeppicker, please cite the DEEP Picker publication:

  Li, D.-W., Hansen, A. L., Yuan, C., Bruschweiler-Li, L., and
  Bruschweiler, R. (2021). DEEP Picker is a Deep Neural Network for
  Accurate Deconvolution of Complex Two-Dimensional NMR Spectra. Nature
  Communications, 12, 5229. doi:10.1038/s41467-021-25496-5

A BibTeX entry for LaTeX users is

  @Article{,
    title = {DEEP Picker is a Deep Neural Network for Accurate Deconvolution of Complex Two-Dimensional NMR Spectra},
    author = {Da-Wei Li and Alexandar L. Hansen and Chunhua Yuan and Lei Bruschweiler-Li and Rafael Brüschweiler},
    journal = {Nature Communications},
    year = {2021},
    volume = {12},
    pages = {5229},
    doi = {10.1038/s41467-021-25496-5},
  }