MathSciNet bibliographic data MR33433 36.0X Levinson, Norman The first boundary value problem for $\varepsilon\Delta u+A(x,y)u\sb x+B(x,y)u_y+C(x,y)u=D(x,y)$$\varepsilon\Delta u+A(x,y)u\sb x+B(x,y)u_y+C(x,y)u=D(x,y)$ for small $\varepsilon$$\varepsilon$. Ann. of Math. (2) 51, (1950). 428–445. Article

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