00408nam a2200121Ia 4500082002000000100004600020245006600066260003500132300002700167490005200194500000500246700003500251  a515.35bG465.FO  aGilbert, Robert P. and Buchanan, James L.  aFirst order elliptic systems; a function theoretic approachb  aNew YorkbAcademic Pressc1983  axi, 281p. Index, Bibl.  aMathematics in Science and Engineeringv v. 163  a  aBuchanan, James L. ; jt. auth.