Electrohydrodynamics I. The Equilibrium of a Charged Gas in a Container Joseph Keller Indiana University Mathematics Journal 1956 text pdf 10.1512/iumj.1956.5.55025 10.1512/iumj.1956.5.55025 en Indiana Univ. Math. J. 5 (1956) 715 - 724 state-of-the-art mathematics http://iumj.org/access/