Sue Ann Hamm, the ex-wife of Oklahoma oil magnate Harold Hamm who was awarded cash and assets worth more than $1 billion in the couple's divorce this week, plans to appeal the judgment on grounds that it grossly undervalues the marital wealth she is entitled to. Claiming she was shortchanged by a ruling that allows the Continental Resources chief executive officer to keep nearly all of an estimated $18 billion rise in his Continental shares during a 26-year marriage, Sue Ann Hamm plans to appeal the decision, Ron Barber, one of the attorneys on her legal team, told Reuters on Thursday.