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1) SIMULTANEOUS SPECTROPHOTOMETRIC DETERMINATION OF FOLIC ACID, THIAMIN, RIBOFLAVIN, AND PYRIDOXAL USING PARTIAL LEAST-SQUARES REGRESSION METHOD
J. Ghasemi and M. Vosough
Spectroscopy Letters
Volume 35, Number 2 / 2002 , Pages 153 - 169.

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http://dx.doi.org/10.1081/SL-120003802

2) Simultaneous spectrophotometric determination of fat-soluble vitamins in multivitamin pharmaceutical preparations
M. Blanco, J. Coello, H. Iturriaga, S. Maspoch, T. Gómez-Cotín, S. Alaoui-Ismailiand E. Rovira
Fresenius' Journal of Analytical Chemistry
Volume 351, Numbers 2-3 / January, 1995, Pages 315-319 .

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http://dx.doi.org/10.1007/BF00321656

3) Simultaneous Spectrophotometric Multicomponent Determination of Folic Acid, Thiamine, Riboflavin, and Pyridoxal by Using Double Divisor–Ratio Spectra Derivative–Zero Crossing
Jahanbakhsh Ghasemi, Bahman Abbasi, Ali Niazi A, E. Nadaf , A. Mordai
Analytical Letters
Volume 37, Number 12 / 2004, Pages 2609 - 2623.

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http://dx.doi.org/10.1081/AL-200029389 

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