Di Paolo, E. R.; Spaggiari, S.; Pannatier, A.; Sadeghipour, F.; Rochat, I.; Hafen, G. . M. Stop Using the Flotation Technique and Start Weighing Salbutamol Pressurised Metered-Dose Inhalers Without Dose Counters. Swiss Med Wkly 2015, 145, w14162.