00340nam a2200121Ia 4500082001900000100001900019245008300038260003200121300001600153490003900169500000500208700000500213  a530.1bM295.TE  aManwell, A. R.  aThe tricomi equation with applications to the theory of plane transonic flowb  aSan FranciscobPitmanc1979  a185p. Index  aResearch notes in Mathematicsv 35  a  a