The lower bound of the least negative eigenvalue — λ2 of the equation δμ+If (r)−λ2] μ = 0
1963 ◽
Vol 2
(4)
◽
pp. 788-789
Keyword(s):
2011 ◽
Vol 33
(3)
◽
pp. 701-705
◽
Keyword(s):
1989 ◽