References
- Hammett , M.E. 1967 . Oscillation and Nonoscillation Theorems for Nonhomogeneous Linear Differential Equations of Second Order, Ph.D. dissertation , Auburn University .
- Waltman , P. 1965 . An oscillation criterion for a nonlinear equation . J. Math. Anal. Appl , 10 : 439 – 441 .
- Wong , J.S.W. 1967 . Some stability conditions for xn+a(t)x2n-1˭ . SIAM J. Appl. Math , 15 : 889 – 892 .