J. V. . Srinivasu, K. Narendra, and B. SubbaRao, “Refractive Properties of Binary Mixtures of 1,4-Butanediol with Methylpyridine Isomers”, Int. J. Sci. Res. Chem. Sci., vol. 3, no. 1, pp. 1–12, Feb. 2016.