- The PL/Perl Language, official PostgreSQL 11 documentation available at https://www.postgresql.org/docs/11/static/plperl.html
- The PL/Java Language, project web-site available at https://github.com/tada/pljava/wiki
- The PL/Java API Documentation, available at https://tada.github.io/pljava/pljava-api/apidocs/index.html
- Apache Maven Project Management software, official web-site available at http://maven.apache.org/
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