Cho, Hee-Sun; Choi, Kwang-Hee; Lee, Sang-Don; Park, Young-Seuk (2009). "Characterizing habitat preference of Eurasian river otter (Lutra lutra) in streams using a self-organizing map". Limnology. 10 (3): 203. Bibcode:2009Limno..10..203C. doi:10.1007/s10201-009-0275-7. S2CID20000248.
Lanszki, József; Molnár, M. & Molnár, T. (2006). "Factors affecting the predation of otter (Lutra lutra) on European pond turtle (Emys orbicularis)". Journal of Zoology. 270 (2): 219. doi:10.1111/j.1469-7998.2006.00132.x.
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Cho, Hee-Sun; Choi, Kwang-Hee; Lee, Sang-Don; Park, Young-Seuk (2009). "Characterizing habitat preference of Eurasian river otter (Lutra lutra) in streams using a self-organizing map". Limnology. 10 (3): 203. Bibcode:2009Limno..10..203C. doi:10.1007/s10201-009-0275-7. S2CID20000248.