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Husain, S., Sarma, N., Swamy, N. S., Alvi, S. N., & Rao, R. N. (1991). High-performance liquid chromatographic separation and determination of small amounts of 2-naphthaleneacetic acid in 1-naphthaleneacetic acid. Journal of Chromatography A, 558(2), 435–439. doi:10.1016/0021-9673(91)80011-5 
10.1016/0021-9673(91)80011-5