Textos interessantes.
http://periodicos.ufpb.br/index.php/economia/article/viewFile/22705/12580
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-65552000000200002
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352006000500022
https://www.researchgate.net/publication/262713404_Classification_of_the_coefficient_of_variation_in_experimentation_with_equine_nutrition
https://www.alice.cnptia.embrapa.br/bitstream/doc/677953/1/Anais175179.pdf