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    "abstract": "Seminal result of Delsarte is archived here",
    "arxiv_id": "physics/9909061",
    "authors": [
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    "journal_ref": "Comptes Rendus Acad. Sci. Paris 206 (1938) 1780-1782",
    "title": "On some functional transformations relative to linear PDEs of second   order",
    "url": "https://arxiv.org/abs/physics/9909061"
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