Exact Solutions to Supergravity
  We find a general p-1-brane solution to supergravity coupled to a p+1-form field strength using the ``standard ansatz'' for the fields. In addition to the well-known elementary and solitonic p-1-brane solutions, which are the only ones preserving half of the supersymmetry (for the cases where the supersymmetry transformations are known), there are other possibilities, the most interesting of which is an elementary type~I string solution with a non-dynamical string source and no conserved charge. 
Anna Tollsten