@Article{	  Schweitzer:2011,
  author	= {M.~A. Schweitzer},
  title		= {Multilevel Particle--Partition of Unity Method},
  year		= {2011},
  journal	= {Numer. Math.},
  volume	= {118},
  pages		= {307--328},
  annote	= {article,ag-schweitzer},
  tnumber	= {2}
}