Gil, A., Poya, R., & Ortigosa, R. (2023). Variational schemes and mixed finite elements for large strain isotropic elasticity in principal stretches: Closed‐form tangent eigensystems, convexity conditions, and stabilised elasticity. International Journal for Numerical Methods in Engineering, 124(16), pp. 3436-3493. doi:10.1002/nme.7254

Gil, Antonio, Roman Poya, and Rogelio Ortigosa. "Variational Schemes and Mixed Finite Elements for Large Strain Isotropic Elasticity in Principal Stretches: Closed‐form tangent Eigensystems, Convexity Conditions, and Stabilised Elasticity." International Journal for Numerical Methods in Engineering 124, no. 16 (2023): 3436-3493.

Gil, Antonio, Roman Poya, and Rogelio Ortigosa. "Variational Schemes and Mixed Finite Elements for Large Strain Isotropic Elasticity in Principal Stretches: Closed‐form tangent Eigensystems, Convexity Conditions, and Stabilised Elasticity." International Journal for Numerical Methods in Engineering 124.16 (2023): 3436-3493.