On the nonlinear behaviour of nematic single crystal elastomers under biaxial mechanic and electrical force fieldsRicardo Diaz Calleja, Pau Díaz-Boïls, P. Llovera-Segovia and A. QuijanoEur. Phys. J. E, 37 7 (2014) 66DOI: https://doi.org/10.1140/epje/i2014-14066-5