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\bigl(V_d(t)-V_s(t)\bigr).  \end{equation}  where $V_s(t)$ and $V_d(t)$ are the somatic and dendritic neuronal membrane potentials; neurons are homogeneously distributed with  the density $p$ per area; $r_{i} $ is the specific intracellular resistivity. resistivity; $sigma $ is the mean conductivity of extracellular medium, assumed to be a constant.  \subsection {Glial contribution into LFP}  The glial contribution into LFP, $\varphi_G(t)$, is proportial to the glial membrane currents of potassium ions, thus can be approximated as follows: