Asymptotic analysis of non-linear ODE

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I'm looking for references on the topic of asymptotic analysis of non linear ODE's of the sort $$ x'' + x'x = 0 $$ This specific case has an analytic solution (with some $\tanh(\cdots)$ involved) and quickly converges to a real value; in my case, I'm dealing with "similar" equations, with some form of $x'x$ involved.