Sturm comparison theorems for ordinary and partial differential equations
1969 ◽
Vol 75
(2)
◽
pp. 335-340
◽
1980 ◽
Vol 10
(1)
◽
pp. 239-246
◽
1978 ◽
Vol 1
(1)
◽
pp. 31-40
◽
2000 ◽
Vol 4
(2)
◽
pp. 151-163
1982 ◽
Vol 36
(2)
◽
pp. 263-276
◽