Universal potential estimates for $1<p\leq 2-\frac{1}{n}$

We extend the so-called universal potential estimates of the Kuusi-Mingione type (J.Funct. Anal. 2012) to the singular case $1<p\leq 2-1/n$ for the quasilinear equation with measure data \begin{equation*} -\operatorname{div}(A(x,\nabla u))=μ \end{equation*} in a bounded open subset $Ω$ of $\mathbb{R}^n$, $n\geq 2$, with a finite signed measure $μ$ in $Ω$. The operator $\operatorname{div}(A(x,\nabla u))$ is modeled after the $p$-Laplacian $Δ_p u:= {\rm div}\, (|\nabla u|^{p-2}\nabla u)$, where the nonlinearity $A(x, ξ)$ ($x, ξ\in \mathbb{R}^n$) is assumed to satisfy natural growth and monotonicity conditions of order $p$, as well as certain additional regularity conditions in the $x$-variable.

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