Sufficient Conditions for Nonoscillation of n-th Order Nonlinear Differential Equations

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1. GRAEF, J. R. and SPIKES, P. W. (1975) - Sufficient conditions for the equations ${(l(t)x^{\prime })}^{\prime }+p(t)g(x,x^{\prime })=h(t;x,x^{\prime })$ to be nonoscillatory, «Funkcialaj Ekvacioj», 18, 35-40. MR385234
2. KIGURADZE, I. (1964) - On the oscillation of solutions of the equation $(d^{m}u/d{t}^m)+a(t){|u|}^{n}sgnu=0$, «Mat. Sb.», 65, 172-187. (Russian). MR173060
3. KIGURADZE, I. (1965) - The problem of oscillation of solutions of nonlinear differential equations, «Differentialnye Uravnenija», 1, 995-1006. (Russian). MR194689

1. Lu-San Chen, Fong-Ming Yu, Sufficient conditions for nonoscillation of forced n-th order retarded functional differential equations