Bott, S., Yu, L., Chen, D., Li, J., Ramirez, J., Wang, P., & Bott, S. (1997). Lanthanide-Promoted Reactions of Aldehydes and Amine Hydrochlorides in Aqueous Solution. Synthesis of 2,3-Dihydropyridinium and Pyridinium Derivatives. The Journal of Organic Chemistry, 62(1), pp. 208-211. doi:10.1021/jo961175n

Bott, Simon, LB Yu, DP Chen, J. Li, J. Ramirez, PG Wang, and SG Bott. "Lanthanide-Promoted Reactions of Aldehydes and Amine Hydrochlorides in Aqueous Solution. Synthesis of 2,3-Dihydropyridinium and Pyridinium Derivatives." The Journal of Organic Chemistry 62, no. 1 (1997): 208-211.

Bott, Simon, et al. "Lanthanide-Promoted Reactions of Aldehydes and Amine Hydrochlorides in Aqueous Solution. Synthesis of 2,3-Dihydropyridinium and Pyridinium Derivatives." The Journal of Organic Chemistry 62.1 (1997): 208-211.