Nonlinear oscillation of second order differential equations with retarded argument
1975 ◽
Vol 106
(1)
◽
pp. 171-185
◽
1973 ◽
Vol 43
(1)
◽
pp. 201-206
1974 ◽
Vol 50
(5-6)
◽
pp. 342-346
◽
2011 ◽
Vol 57
(2)
◽
pp. 409-416
2015 ◽
Vol 36
(7)
◽
pp. 930-941