Shohat J, Wittenberg C, Erman A, Rosenfeld J, Boner G (February 1999). "Acute and chronic effects of spirapril, alone or in combination with isradipine on kidney function and blood pressure in patients with reduced kidney function and hypertension". Scandinavian Journal of Urology and Nephrology. 33 (1): 57–62. doi:10.1080/003655999750016294. PMID10100366.
Shohat J, Wittenberg C, Erman A, Rosenfeld J, Boner G (February 1999). "Acute and chronic effects of spirapril, alone or in combination with isradipine on kidney function and blood pressure in patients with reduced kidney function and hypertension". Scandinavian Journal of Urology and Nephrology. 33 (1): 57–62. doi:10.1080/003655999750016294. PMID10100366.