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Ferro, D., & Della Gatta, G. (1987). Enthalpies of sublimation and fusion of monophenylurea and diphenyl-1,3 urea. Thermochimica Acta, 122(1), 189–195. doi:10.1016/0040-6031(87)80119-3 
10.1016/0040-6031(87)80119-3