Nageswara Rao, R.; Nagaraju, P.; Srinivasulu, C.; Radha Krishnamurthy, P.; Sireesha, D.; Sumanth Reddy, V. Spectrophotometric Determination of Butorphanol Tartrate and Telmisartan in Bulk and Pharmaceutical Formulations. ajc 2016, 16, 1953-1955.