Luo Ning, Wang De-Ning and Ying Sheng-Kang
Polymer
Volume 37, Issue 14, July 1996, Pages 3045-3047
Hydrogen bonding between urethane and urea: band assignment for the carbonyl region of FTi.r. spectrum
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http://dx.doi.org/10.1016/0032-3861(96)89403-1