On the asymptotic solutions for a class of second order differential equations with slowly varying coefficients
1965 ◽
Vol 2
(2)
◽
pp. 244-249
◽
1959 ◽
Vol 23
(3)
◽
pp. 730-744
◽
2007 ◽
Vol 327
(1)
◽
pp. 47-62
◽
2010 ◽
Vol 23
(9)
◽
pp. 980-983
◽
2011 ◽
Vol 57
(2)
◽
pp. 409-416
2015 ◽
Vol 36
(7)
◽
pp. 930-941