Alien species in the Mediterranean Sea by 2010. A contribution to the application of European Union's Marine Strategy Framework Directive (MSFD). Part I
https://rua.ua.es/dspace/bitstream/10045/34819/1/Zenetos_et_al.2010.pdf

Alien species in the Mediterranean Sea by 2012. A contribution to the application of European Union's Marine Strategy Framework Directive (MSFD). Part 2
https://rua.ua.es/dspace/bitstream/10045/34821/1/Zenetos_et_al_2_2012.pdf

Marine alien species in Greek Seas: Additions and amendments by 2010.
https://okeanos-dspace.hcmr.gr/bitstream/handle/123456789/655/GB/6918.pdf?sequence=1

Setting priorities for regional conservation planning in the Mediterranean Sea
http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0059038&type=printable

Invading the Mediterranean Sea: biodiversity patterns shaped by human activities
https://www.frontiersin.org/articles/10.3389/fmars.2014.00032/full

As suggested by @jakob (thanks!), here it is the link to the Global Register of Introduced and Invasive Species (GRIIS)
http://www.griis.org/

Here it is a paper dealing with this database:
https://www.nature.com/articles/sdata2017202