On the nonnegativity of Green's functions.
Richard Bellman (1963)
Bollettino dell'Unione Matematica Italiana
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Richard Bellman (1963)
Bollettino dell'Unione Matematica Italiana
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Richard Bellman (1964)
Bollettino dell'Unione Matematica Italiana
Similarity:
Harold Simpson (1962)
Bollettino dell'Unione Matematica Italiana
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G. G. Legatos (1966)
Bollettino dell'Unione Matematica Italiana
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