@article{=Oliveira20144, title = "Introdução", journal = "", volume = "", number = "0", pages = "21-30", year = "2017", note = issn = "" doi ="http://dx.doi.org/10.5151/9788580391527-01", url ="https://openaccess.blucher.com.br/", author = "Oliveira,Adalberto", author = "Rados,Gregório Jean Varvakis", }