H. Booth, D. Huckle and I. M. Lockhart. Conformational studies on 2-methyl- and 2,NN-trimethyl-chroman-3-amine and derivatives // Journal of the Chemical Society, Perkin Transactions 2, 1973 , Is. 2, p. 227-232.
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http://dx.doi.org/10.1039/P29730000227