Carine B. Bourguet, Caroline Proulx, Sophie Klocek, David Sabatino, et al.. "Solution-phase submonomer diversification of aza-dipeptide building blocks and their application in aza-peptide and aza-diketopiperazine synthesis" Journal of Peptide Science Vol. 16 Iss. 6 (2010)
Available at: http://works.bepress.com/david_sabatino/1/