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Suzuki, K.; Onishi, S.-I.; Koide, T.; Seki, S., Vapor Pressures of Molecular Crystals. XI. Vapor Pressures of Crystalline Urea and Diformylhydrazine. Energies of Hydrogen Bonds in These Crystals, Bull. Chem. Soc. Jpn., 1956, 29, 127-31. [all data]