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Fred Elhi, Karl Karu, Pille Rinne, Kadi-Anne Nadel, Martin Järvekülg, Alvo Aabloo, Tarmo Tamm, Vladislav Ivaništšev, Kaija Põhako-Esko. "Understanding the Behavior of Fully Non-Toxic Polypyrrole-Gelatin and Polypyrrole-PVdF Soft Actuators with Choline Ionic Liquids". Actuators, 2020, 9, 40.