Arens, J. F.; van Dorp, D. A. (1948). "A new method for the synthesis of α,β-unsaturated aldehydes. Preparation of β-methylcinnamic aldehyde, citral and β-ionylidene acetaldehyde". Recueil des Travaux Chimiques des Pays-Bas: 973–979. doi:10.1002/recl.19480671206.