1. American Bureau of Shipping 2011 Ballast water treatment advisory (American Bureau of Shipping, Houston) ww2.eagle.org/content/eagle/en.html
2. Antonov , J. I. Locarnini , R. A. Boyer , T. P. Mishonov , A. V. Garcia , H. E. 2006 World Ocean Atlas 2005, volume 2: Salinity S. Levitus https://www.nodc.noaa.gov/OC5/WOA05/pubwoa05.html
3. Aquatic non-indigenous and cryptogenic species (AquaNIS) 2015 http://www.corpi.ku.lt/databases/index.php/aquanis/
4. Green Plants
5. Geographical patterns in range extension of Ponto-Caspian macroinvertebrate species in Europe;Bij de Vaate;Canadian Journal of Fisheries and Aquatic Science,2002