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Research supported in part by the Danish Natural Science Research Council and the National Science Foundation grant MCS-77-02831
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Jørgensen, P.E.T. Essential self-adjointness of semibounded operators. Math. Ann. 237, 187–192 (1978). https://doi.org/10.1007/BF01351681
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DOI: https://doi.org/10.1007/BF01351681