00299nam a2200121Ia 4500082002000000100002000020245003600040260002500076300002000101490004600121500000500167700000500172  a515.35bW471.ES  aWendland, W. L.  aElliptic systems in the planeb  aLondonbPitmanc1979  axi, 404p. Index  aMonographs and studies in Mathematicsv 3  a  a