J. Chem. Soc. B, 1971, 1231 - 1240,
The conformations of 3,4-dihydro-2H-1,5-benzodioxepin, and its derivatives as determined from their ultraviolet absorption spectra
A. W. Archer, P. A. Claret and D. F. Hayman
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http://dx.doi.org/10.1039/J29710001231