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<xml><bibliography><APA>Md. Alal HOSEN. (2015) Determination of Approximate Periods of Duffing-harmonic Oscillator. &lt;i&gt;Walailak Journal of Science and Technology&lt;/i&gt;, &lt;i&gt;12&lt;/i&gt;(10), 923.</APA><Chicago>Md. Alal HOSEN. "Determination of Approximate Periods of Duffing-harmonic Oscillator". Walailak Journal of Science and Technology  12 (2015):923.</Chicago><MLA>Md. Alal HOSEN. Determination of Approximate Periods of Duffing-harmonic Oscillator. Walailak University:ม.ป.ท. 2015.</MLA></bibliography></xml>
