Fuks, R., Baudoux, D., Piccinnileopardi, C., Declercq, J.-P., & Vanmeerssche, M. (1988). A New and Facile Synthesis of Ketene Imines and Their 2-iminoazetidine Dimer From Nitriles Via Their Nitrilium Salts. The Journal of Organic Chemistry, 53(1), 18-22. https://doi.org/10.1021/jo00236a005 (Original work published 1988)