On Lyapunov's inequality for disfocality
1981 ◽
Vol 83
(2)
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pp. 486-494
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2001 ◽
Vol 46
(8)
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pp. 1285-1288
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2013 ◽
pp. 11-37
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2017 ◽
Vol 312
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pp. 192-197
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2006 ◽
Vol 19
(12)
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pp. 1293-1299
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2020 ◽
Vol 20
(4)
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pp. 19-24