@article {1491, title = {Small-Strain Modeling of Helical Dielectric Elastomer Actuators}, journal = {IEEE/ASME TRANSACTIONS ON MECHATRONICS}, volume = {17}, year = {2012}, pages = {318{\textendash}325}, keywords = {Bioengineering}, issn = {1083-4435}, author = {F. Carpi and D. De Rossi} }