<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e172" altimg="si441.svg"><mml:msub><mml:mrow><mml:mi mathvariant="script">H</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math> model reduction for diffusively coupled second-order networks by convex-optimization
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