DEVELOPMENT AND VALIDATION OF FIRST ORDER DERIVATIVE UV SPECTROPHOTOMETRIC METHOD FOR THE ESTIMATION OF TENOFOVIR DISOPROXIL FUMARATE, LAMIVUDINE AND EFAVIRENZ IN BULK AND TABLET DOSAGE FORM Journal title: Int J of Preclin & Pharm Res Authors: Murugan S*, Pranabesh Sikdar, Subhashis Debnath, Niranjan Babu M Subject(s):