1. For books on piperidine alkaloids, see:
2. The Pyridine and Piperidine Alkaloids: Chemistry and Pharmacology;Fodor,1985
3. Pyridine and Piperidine Alkaloids: An Update;Schneider,1996
4. For reviews on piperidine alkaloids, see:
5. Pyrrole, pyrrolidine, piperidine, pyridine, and azepine alkaloids