Exchange Lemmas for Singular Perturbation Problems with Certain Turning Points
2000 ◽
Vol 167
(1)
◽
pp. 134-180
◽
1979 ◽
Vol 10
(3)
◽
pp. 447-455
◽
2019 ◽
Vol 07
(12)
◽
pp. 2979-2989
1970 ◽
Vol 1
(2)
◽
pp. 141-146
◽