Estudos
https://www.sciencedirect.com/science/article/abs/pii/S0944711304701762
https://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-83242012000600007
https://onlinelibrary.wiley.com/doi/abs/10.1002/9781119618973.ch21
http://drs.nio.org/drs/bitstream/handle/2264/426/Sci_Rep_42_29.pdf?sequence=1&isAllowed=y