Geodesic
On Parametric Resonance or Why a Swing Swings, or Why it is Useful to Solve Differential Equations
Matematičeskoe obrazovanie, Tome 47 (2008) no. 3, pp. 27-33.

Voir la notice de l'article provenant de la source Math-Net.Ru

The model of a pendulum of variable length is studied with the methods of ordinary differential equations. 
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     author = {S. V. Dvoryaninov},
     title = {On {Parametric} {Resonance} or {Why} a {Swing} {Swings,} or {Why} it is {Useful} to {Solve} {Differential} {Equations}},
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S. V. Dvoryaninov. On Parametric Resonance or Why a Swing Swings, or Why it is Useful to Solve Differential Equations. Matematičeskoe obrazovanie, Tome 47 (2008) no. 3, pp. 27-33. http://geodesic.mathdoc.fr/item/MO_2008_47_3_a1/