1. 1. T Aotsuka, H Hosono, T Kurihara, Y Nakamura, T Matsui, and F. Kobayashi, 1,4-Benzothiazine-2-acetic acid derivatives, processes for production thereof and their use . Eur. Pat. 492,667 A, 1992 [C.A. 117: 151,006, 1992].
2. Improved exercise tolerance after propranolol, diltiazem or nifedipine in angina pectoris: Comparison at 1, 3 and 8 hours and correlation with plasma drug concentration
3. Pharmacologic profile of amlodipine
4. 4. JF Cavalla, and JM Johnson, Benzothiazine derivatives with pharmaceutical properties . Brit. Pat. 1,244,481, 1971 [CA. 75: 129,824, 1971].