(adsbygoogle = window.adsbygoogle || []).push({}); how to get the Lagrangian that generates certain diff equation ???

I have an ordinary differential equation of second order. I am looking for the Lagrangian(s) for which this equation is the Euler-Lagrange equation. I need a practical reference specifically written for one degree of freedom (one equation), I'm not interested in general theorems of existence or highly geometrical language. I found some reference by Darboux in 1894 but its in French. Any english reference?

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# How to get the Lagrangian that generates certain diff equation ?

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