Artigo sobre Crow’s Foot Notation no site da University of Regina
http://www2.cs.uregina.ca/~bernatja/crowsfoot.html

Artigo da lucidchart sobre DER (notação Peter Chen e Crow's foot notation)
https://www.lucidchart.com/pages/pt/o-que-e-diagrama-entidade-relacionamento

Taglibs
https://www.caelum.com.br/apostila-java-web/usando-taglibs/

Filter e interceptor
http://www.mkjava.com/tutorial/filter-vs-interceptor/

Maven Repo
https://mvnrepository.com/