The qsmooth package is described in:

  Hicks SC, Okrah K, Paulson JN, Quackenbush J, Irizarry RA, Corrado
  Bravo H (2018). “Smooth quantile normalization.” _Biostatistics_,
  *19*(2).

A BibTeX entry for LaTeX users is

  @Article{qsmooth,
    author = {Stephanie C. Hicks and Kwame Okrah and Joseph N. Paulson and John Quackenbush and Rafael A. Irizarry and Hector {Corrado Bravo}},
    title = {Smooth quantile normalization},
    journal = {Biostatistics},
    year = {2018},
    volume = {19},
    number = {2},
    pubmed = {29036413},
  }

The qsmoothGC functionlity is described in:

  Van den Berge K, Chou H, Roux de Bezieux H, Street K, Risso D, Ngai
  J, Dudoit S (2021). “Normalization benchmark of ATAC-seq datasets
  shows the importance of accounting for GC-content effects.”
  _bioRxiv_.

A BibTeX entry for LaTeX users is

  @Article{qsmoothGC,
    author = {Koen {Van den Berge} and Hsin-Jung Chou and Hector {Roux de Bezieux} and Kelly Street and Davide Risso and John Ngai and Sandrine Dudoit},
    title = {Normalization benchmark of ATAC-seq datasets shows the importance of accounting for GC-content effects},
    journal = {bioRxiv},
    year = {2021},
  }