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Allen A. Lai, G. Bruce Birrell, O. Hayes Griffith. "Electron Spin Resonance Study of X‐Irradiated Single Crystals of Di‐n‐butyl Oxalate–Urea and Di‐n‐butyl Malonate–Urea Inclusion Compounds." Journal of Chemical Physics 53.11 (1970) 4399-4400