A Guide to Create User-Defined Extension Modules to Postgres - Highgo Software Inc.
postgresql - How to Full Text Search - Extension "tsvector" is not supported by Amazon RDS - Stack Overflow
Finding Diacritics in a Postgres Table
PostgreSQL: ERROR: could not open extension control file “/usr/share/ postgresql/9.3/extension/tablefunc.control”: No such file or directory | LinkSprite Learning Center
PostgreSQL – Function to remove accents in string – Long's blog