SEARCH Articles Figures Tables Approximations to the Poisson-Boltzmann Equation Boltzmann equation Boltzmann equation approximation Equation Poisson Equation Poisson-Boltzmann Non-Poisson One-term approximation Poisson Poisson Term Poisson-Boltzmann The Approximations The Boltzmann equation The Poisson Equation The Poisson-Boltzmann equation The expansion Zero-approximation Zero-one