Detry, JM., Abouantoun, S., & Wyns, W. (1981). Incidence and Prognostic Implications of Severe Ventricular Arrhythmias During Maximal Exercise Testing. Cardiology : international journal of cardiovascular medicine, surgery and pathology, 68, 35-43. https://doi.org/10.1159/000173315 (Original work published 1981)