M. .K. Oommen, S. C. Eapen, S. . Velayudhankutty, and D. Haribabu, “UV-VIS SPECTROPHOTOMETRIC METHOD FOR ESTIMATION OF PREGABALIN AND METHYLCOBALAMIN IN BULK AND CAPSULE DOSAGE FORM ”, ijprls, vol. 2, no. 1, pp. 6 - 15, Feb. 2014.