English: Carnmalm, B.; Jacupovic, E.; Johansson, L.; De Paulis, T.; Ramsby, S.; Stjernstrom, N. E.; Renyi, A. L.; Ross, S. B.; Ogren, S. O. (1974). "Antidepressant agents. 1. Chemistry and pharmacology of amino-substituted spiro[5H-dibenzo[a,d]cycloheptene-5,1'-cycloalkanes]". Journal of Medicinal Chemistry. 17 (1): 65–72. doi:10.1021/jm00247a014.
Bernt Sigfrid Emanuel Carnmalm, et al., US4053632 (1977 to Astra Lakemedel AB).
Winthrop, Stanley O.; Davis, M. A.; Myers, G. S.; Gavin, J. G.; Thomas, R.; Barber, R. (1962). "New Psychotropic Agents. Derivatives of Dibenzo[a,d]-1,4-cycloheptadiene". The Journal of Organic Chemistry. 27 (1): 230–240. doi:10.1021/jo01048a057.
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