Diffusion akantu (features/17-create-an-element-group-using-a-node-group-with-python-interface) Change
rAKA/extra_packages/extra-materials/src/material_viscoelastic/material_stiffness_proportional.cc
rAKA/extra_packages/extra-materials/src/material_viscoelastic/material_stiffness_proportional.cc