00308nam a2200121Ia 4500082002000000100002400020245003900044260003500083300001600118490004200134500000500176700000500181  a515.78bD935.IP  aDu Plessis, Nicolas  aIntroduction to potential theoryb  aEdinburghbOliver & Boydc1970  aviii, 177p.  aUniversity Mathematical monographv 7  a  a