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Bardos, C., Brézis, D. & Brézis, H. Perturbations singulières et prolongements maximaux d'opérateurs positifs. Arch. Rational Mech. Anal. 53, 69–100 (1973). https://doi.org/10.1007/BF00735701
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DOI: https://doi.org/10.1007/BF00735701