\delta \left[ \phi \cdot \left( \xi_{O,o} \, s_o + \xi_{O,g} \, s_g \right) \right] = V^{-1} \, \delta Q_O

\delta \left[ \phi \cdot \left( \xi_{G,o} \, s_o + \xi_{G,g} \, s_g \right) \right] = V^{-1} \, \delta Q_G

\delta \left[ \phi \cdot \xi_{W,w} \, s_w \right] = V^{-1} \, \delta Q_W

\phi \cdot \left[ \frac{1}{B_o} \, s_o + \frac{R_v}{B_g} \, s_g  \right] = V^{-1} \, \delta qQ_O + \phi_i \cdot \left[ \frac{1}{B_{oi}} \, s_o + \frac{R_{vi}}{B_{gi}} \, s_{gi}  \right]

\phi \cdot \left[ \frac{R_s}{B_o} \, s_o + \frac{1}{B_g} \, s_g  \right] = V^{-1} \, \delta qQ_G + \phi_i \cdot \left[ \frac{R_{si}}{B_{oi}} \, s_o + \frac{1}{B_{gi}} \, s_{gi}  \right]

\phi \cdot \frac{1}{B_w} \, s_w  = V^{-1} \, \delta qQ_W + \phi_i \cdot  \frac{1}{B_{wi}} \, s_{wi} 

\phi_n \cdot \left[ \frac{1}{B_o} \, s_o + \frac{R_v}{B_g} \, s_g  \right] = V_e^{-1} \, \delta qQ_O + \left[ \frac{1}{B_{oi}} \, s_o + \frac{R_{vi}}{B_{gi}} \, s_{gi}  \right]

\phi_n \cdot \left[ \frac{R_s}{B_o} \, s_o + \frac{1}{B_g} \, s_g  \right] = V_e^{-1} \, \delta qQ_G + \left[ \frac{R_{si}}{B_{oi}} \, s_o + \frac{1}{B_{gi}} \, s_{gi}  \right]

\phi_n \cdot \frac{1}{B_w} \, s_w  = V_e^{-1} \, \delta qQ_W + \frac{1}{B_{wi}} \, s_{wi} 

\phi_n(p) = \phi(p) / \phi_i 

\frac{1}{B_o} \, s_o + \frac{R_v}{B_g} \, s_g  = F_O/\phi_n 

F_O = V_e^{-1} \, \delta qQ_O + \left[ \frac{1}{B_{oi}} \, s_o + \frac{R_{vi}}{B_{gi}} \, s_{gi}  \right]

\frac{R_s}{B_o} \, s_o + \frac{1}{B_g} \, s_g  = F_G/\phi_n

F_G = V_e^{-1} \, \delta qQ_G + \left[ \frac{R_{si}}{B_{oi}} \, s_o + \frac{1}{B_{gi}} \, s_{gi}  \right]

 \frac{1}{B_w} \, s_w  = F_W/\phi_n

F_W  = V_e^{-1} \, \delta qQ_W + \frac{1}{B_{wi}} \, s_{wi}