Brohet, C., Legrand, N., Derwael, C., Dee, D., Fayn, J., Rubel, P., & Goenen, M. (1993). Serial analysis of orthogonal ECGs and vectorcardiograms after heart transplantation. Journal of Electrocardiology, 26 Suppl, 98. https://hdl.handle.net/2078.5/85243 (Original work published 1993)