A simple local-sufficiency condition based on the second variation
2007 ◽
Vol 463
(2081)
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pp. 1199-1210
1960 ◽
Vol 3
(3)
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pp. 263-271
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1997 ◽
Vol 349
(8)
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pp. 3093-3104
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1949 ◽
Vol s1-24
(4)
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pp. 241-247
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