To cite mritc in publications use:

Dai Feng, Luke Tierney (2011). mritc: A Package for MRI Tissue Classification. Journal of Statistical Software, 44(7), 1-20. URL http://www.jstatsoft.org/v44/i07/.

Corresponding BibTeX entry:

  @Article{,
    title = {{mritc}: A Package for {MRI} Tissue Classification},
    author = {Dai Feng and Luke Tierney},
    journal = {Journal of Statistical Software},
    year = {2011},
    volume = {44},
    number = {7},
    pages = {1--20},
    url = {http://www.jstatsoft.org/v44/i07/},
  }