basis of recordPõllumäe, A.; Kotta, I.; Kotta, J. (2006). Port biological sampling as a tool for monitoring invasive species in high-risk areas of bioinvasions, in: Ojaveer, H.; Kotta, J. (Ed.) (2006). Alien invasive species in the north-eastern Baltic Sea: population dynamics and ecological impacts. Estonian Marine Institute Report Series, 14: pp. 35-41 (look up in IMIS) [details]