  In this short note, we establish a sharp Morrey regularity theory for an even
order elliptic system of Rivi\`ere type: \begin{equation*}
  \Delta^{m}u=\sum_{l=0}^{m-1}\Delta^{l}\left\langle V_{l},du\right\rangle
+\sum_{l=0}^{m-2}\Delta^{l}\delta\left(w_{l}du\right)+f\qquad \text{in} B^{2m}
\end{equation*} under minimal regularity assumptions on the coefficients
functions V^l, w^l and that f belongs to certain Morrey space. This can be
regarded as a further extension of the recent L^p-regularity theory obtained by
Guo-Xiang-Zheng [15], and generalizes [7, 27] for second and fourth order
elliptic systems.
