P. Seetharama Sarma, M. Surayanarayana, P. Pratap Reddy, M. Khalilulah, C. Praveen, and A. Kalyan Chakravarthy, “An Improved Process for the Preparation of 4-(N,N-Disubstituted amino)butaraldehyde Acetals”, ajc, vol. 20, no. 8, pp. 6446–6450, Mar. 2010.