+++Colloid & Polymer Science (springer)

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Structure of the hard segments in trans,trans-diisocyanato dicyclohexylmethane based PU elastomers: A crystallographic analysis of bis-urea from diphenyl methane-4-isocyanate and 1,4-butane diamine
L. Born and H. Hespe
Colloid & Polymer Science Volume 263, Number 4 / April, 1985

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http://dx.doi.org/10.1007/BF01412250

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