Owen, David R. Properties of stress functionals for materials with elastic range, with applications to classical theories of elastic-plastic materials Mathematics Technical Report Elasticity.;Plasticity.;Shear flow.;Fluid mechanics. 1969-01-01
    https://kilthub.cmu.edu/articles/journal_contribution/Properties_of_stress_functionals_for_materials_with_elastic_range_with_applications_to_classical_theories_of_elastic-plastic_materials/6479174
10.1184/R1/6479174.v1