D. Touboul, M. Conradin Jecklin, and R. Zenobi, “Exploring Deprotonation Reactions on Peptides and Proteins at Atmospheric Pressure by Electro-Sonic Spray Ionization-Mass Spectrometry (ESSI-MS)”, Chimia, vol. 62, no. 4, p. 282, Apr. 2008, doi: 10.2533/chimia.2008.282.