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Entrata in Redazione il 10 gennaio 1972.
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Brown, R.C., Green, G.B. & Krall, A.M. Eigenfunction expansions under multipoint-integral boundary conditions. Annali di Matematica 95, 231–243 (1973). https://doi.org/10.1007/BF02410717
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DOI: https://doi.org/10.1007/BF02410717