Boundary-Value Problems of Linear Differential Equations of the Second-Order
1999 ◽
pp. 144-196
1968 ◽
Vol 48
(6)
◽
pp. 415-418
◽
2013 ◽
Vol 65
(5)
◽
pp. 694-708
◽
1918 ◽
Vol 19
(1)
◽
pp. 97-97