Parveenr, R., Ahmed, M.A., Husain, S.A. and Parveen, S. 2001. ?NEW DISPERSE DYES FROM SUBSTITUTED PYRIDINES. PART-I. SYNTHESIS OF METHYL-4, 6,DmYDROXY-20xo-l-PHENYL-5-ARYLAZOPYRIDINE-3-CARBOXYLATE AND THEIR DERIVATIVES. Biological Sciences - PJSIR. 44, 4 (Aug. 2001), 244–247.