Bildhauer, Michael, Martin Fuchs, and Xiao Zhong. 2009. “A Regularity Theory for Scalar Local Minimizers of Splitting-Type Variational Integrals ”. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE 6 (3):385-404. https://doi.org/10.2422/2036-2145.2007.3.02.