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Communicated by J. L. Lions
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Livne, A., Schuss, Z. Singular perturbations for degenerate elliptic equations of second order. Arch. Rational Mech. Anal. 52, 233–243 (1973). https://doi.org/10.1007/BF00247734
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DOI: https://doi.org/10.1007/BF00247734