Cufí, Julià, and Joan Verdera. 2018. “Differentiability Properties of Riesz Potentials of Finite Measures and Non-Doubling Calderón--Zygmund Theory”. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE 18 (3):1081-1123. https://doi.org/10.2422/2036-2145.201608_012.