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khan, s.u., et al. (2012). "low-velocity impact response of foam and honeycomb cored sandwich composite panels ¨C a review." materials & design, 37, 119¨C134.
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wang, j., et al. (2021). "effect of isocyanate index on the mechanical properties of rigid polyurethane foams." journal of cellular plastics, 57(4), 521¨C537.
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