Kotta, J., Kotta, I., Simm, M., Lankov, A., Lauringson, V., Põllumäe, A., Ojaveer, H., 2006. Ecological consequences of biological invasions: three invertebrate case studies in the north-eastern Baltic Sea. Helgoland Marine Research 60, 106–112. doi:10.1007/s10152-006-0027-6

Kotta, J., Kotta, I., Simm, M., Lankov, A., Lauringson, V., Põllumäe, A., Ojaveer, H., 2006. Ecological consequences of biological invasions: three invertebrate case studies in the north-eastern Baltic Sea. Helgoland Marine Research 60, 106–112. doi:10.1007/s10152-006-0027-6