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},
  }