1. Zooplankton in the Baltic Sea area;Ackefors;Zoologisk revy,1972
2. Invaders in the Caspian Sea;Aladin,2002
3. A testable linear model for diversity trends in estuaries;Attrill;Journal of Animal Ecology,2002
4. Ecotone or ecocline: ecological boundaries in estuaries. Estuarine;Attrill;Coastal and Shelf Science,2002
5. Baltic Sea Alien Species Database, 2005. http://www.ku.lt/nemo/mainnemo.html (last visited March 4th 2005).