MathSciNet bibliographic data MR1038899 (91e:35025) 35B25 (35B65) Han, H.; Kellogg, R. B. Differentiability properties of solutions of the equation $-\epsilon\sp 2\Delta u+ru=f(x,y)$$-\epsilon\sp 2\Delta u+ru=f(x,y)$ in a square. SIAM J. Math. Anal. 21 (1990), no. 2, 394–408. Article

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