https://lucene.apache.org/core/3_5_0/api/all/org/apache/lucene/analysis/pt/class-use/PortugueseStemmer.html
Uses of Class org.apache.lucene.analysis.pt.PortugueseStemmer (Lucene 3.5.0 API)
https://opennlp.apache.org/docs/2.5.4/apidocs/opennlp-tools/opennlp/tools/stemmer/snowball/portugueseStemmer.html
portugueseStemmer (Apache OpenNLP Tools 2.5.4 API)
declaration: package: opennlp.tools.stemmer.snowball, class: portugueseStemmer
apache opennlptoolsapi