Nilsson , A., K. Danielson, G. Engberg, and S. Henneberg. 1990. “Emla for Pain Relief During Arterial Cannulation: A Double-Blind, Placebo-Controlled Study of a Lidocaine-Prilocaine Cream”. Upsala Journal of Medical Sciences 95 (1):87-94. https://doi.org/10.3109/03009739009178579.