D. R. Sidler, N. Barta, W. Li, E. Hu, L. Matty, N. Ikemoto, J. S. Campbell, M. Chartrain, K. Gbewonyo, R. Boyd, E. G. Corley, R. G. Ball, R. D. Larsen, P. J. Reider, Paul J: Efficient synthesis of the optically active dihydropyrimidinone of a potent α1A-selective adrenoceptor antagonist. In: Canadian Journal of Chemistry. 80 (6), 2002, S. 646–652, doi:10.1139/v02-079.