A lower bound for the first eigenvalue of an elliptic operator
1983 ◽
Vol 94
(2)
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pp. 328-337
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2017 ◽
Vol 473
(2204)
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pp. 20160877
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1968 ◽
Vol 19
(2)
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pp. 292-292
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1974 ◽
Vol 25
(3)
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pp. 422-424
1982 ◽
Vol 17
(2)
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pp. 233-238
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1984 ◽
Vol 17
(1)
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pp. 31-44
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2015 ◽
Vol 07
(03)
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pp. 505-511
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2012 ◽
Vol 64
(4)
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pp. 1023-1041
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1999 ◽
Vol 190
(2)
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pp. 383-398
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