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The contributions of potassium currents through mebranes of both neurons and glial cells are additive. Thus taking into account e.(\ref{e1}), we get  \begin{equation} \label{e4}  \varphi(t) = k_1 ~\nu(t) +  k_3 \bigl(V_d(t)-V_s(t)\bigr) ~\bigl(V_d(t)-V_s(t)\bigr)  + \varphi_G(t) \end{equation}  where $k_3={p}/({2\, \sigma \, r_{i} })$.  A set of equations (\ref{e3}) and (\ref{e4}) determines the LFP model. According to these equations, LFP is governed by the somatic and dendritic membrane voltages as well as the firing rate of principal neurons. The model might be matched to experimental data by fitting four coefficients, $k_1$, $k_2$, $k_3$ and $\tau$.