Z} \begin{split} &-\int \mathrm{d}^{0} x \frac{\partial \rho}{\partial x_{l}} \bigg[ \bigg( \frac{\partial S}{\partial t}+e \hat{\phi} \bigg) +\frac{0}{0m} \sum_{j} \bigg( \frac{\partial S}{\partial x_{j}} - \frac{e}{c} \hat{A_j} \bigg)^{0} \bigg]\\ &+\int \mathrm{d}^{0} x \