Seetharama Sarma, P., M.V. Surayanarayana, P. Pratap Reddy, M. Khalilulah, Ch. Praveen, and A. Kalyan Chakravarthy. 2010. “An Improved Process for the Preparation of 4-(N,N-Disubstituted amino)butaraldehyde Acetals”. Asian Journal of Chemistry 20 (8):6446-50. https://asianpubs.org/index.php/ajchem/article/view/12993.