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Potmischil, F.; Marinescu, M.; Nicolescu, A.; Deleanu, C.; Hillebrand, M (2008). "Hydroacridines: part 29. 15N NMR chemical shifts of 9-substituted 1,2,3,4,5,6,7,8-octahydroacridines and their N-oxides - Taft, Swain-Lupton, and other types of linear correlations". Magn. Reson. Chem.46 (12): 1141–1147. doi:10.1002/mrc.2335. PMID18844244. S2CID5779503.