* May 28, 2011
  o Electronic journal version available online

* May 25, 2011
  o Returned comments/corrections of final version

* May 17, 2011
  o Final version accepted by Adv.Math.

* March 8, 2011
  o Paper accepted by Adv.Math. (minor revisions required)

* November 5, 2010
  o Submitted to journal Advances in Math

* October 30, 2010
  o Added ref. to Andrews and Rose paper
  o Added ref. MacMahon's paper
  o Added ref. OEIS concerning S*-sequence
  o Submitted another new version to arXiv
  o Submitted to journal Xxxxxxxxxxx

* October 13, 2010
  o Corrected some typos (Thanks Kathrin)
  o Added extra section "Concluding remarks"
  o Add urls to references
  o Added more acknowledgments 
  o Submitted new version to arXiv

* August 13, 2010
  o Added link to arXiv

* August 6, 2010
  o Submitted to arXiv
  o Submitted to journal Xxxxxx

* August 4, 2010
  o First draft