Spectrum of sturm ? Liouville equation with unbounded operator coefficient
1972 ◽
Vol 5
(4)
◽
pp. 322-323
◽
2011 ◽
Vol 218
(5)
◽
pp. 2113-2121
1971 ◽
Vol 5
(1)
◽
pp. 9-18
◽
1968 ◽
Vol 2
(2)
◽
pp. 153-157
◽
1976 ◽
Vol 10
(1)
◽
pp. 145-180
◽