Please, direct any questions, comments, or suggestions to the e-mails provided below:

• Vaux S. D. Gomes
  Federal University of the Semi-Arid
  Rio Grande do Norte, Brazil
  
  
  https://sites.google.com/site/vauxgomes/
• Tibérius O. Bonates, Ph.D.
  Department of Statistics and Applied Mathematics
  Federal University of Ceará
  Fortaleza, Brazil
  
  
  http://www.lia.ufc.br/~tiberius/