A Sturm theorem for strongly elliptic systems and applications
1969 ◽
Vol 75
(5)
◽
pp. 1025-1028
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Keyword(s):
1994 ◽
Vol 24
(3-4)
◽
pp. 219-231
2013 ◽
Vol 265
(3)
◽
pp. 375-398
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Keyword(s):