• Freshwater sponges in Estonia : genetic and morphological identificationRoovere, Tiiu; Lopp, Annika; Reintamm, Tõnu; Kuusksalu, Anne; Richelle-Maurer, Evelyn; Kelve, MerikeProceedings of the Estonian Academy of Sciences. Biology. Ecology2006 / 3, p. 216-227 : ill