1. 1H NMR Spectral Study of Some 4-Hydroxy-2,6-diphenylpiperidines and a Systematic Analysis of 1H Chemical Shifts in Some Piperidines and 3,7-Diazabicyclo[3.3.1]nonane Derivatives.;Pandiarajan;Indian J. Chem., Sect. B: Org. Chem. Incl. Med. Chem.,2000