Dekeyser, P., Bouve, J., Clement, D., Degraef, R., Meurant, JP., Rorive, G., & Vanthillo, J. (1989). Isradipine in Essential-hypertension - the Belgian General-practitioners Study. The American Journal of Medicine, 86(4A), 103-109. https://doi.org/10.1016/0002-9343(89)90202-7 (Original work published 1989)