Karpacheva V.A. (1969) Use of direct spectrophotometry in UV for the determination of vitamin A in blood and liver. Voprosy Meditsinskoi Khimii, 15(4), 444-447.

et al. Use of direct spectrophotometry in UV for the determination of vitamin A in blood and liver // Voprosy Meditsinskoi Khimii. - 1969. - V. 15. -N 4. - P. 444-447.

et al., "Use of direct spectrophotometry in UV for the determination of vitamin A in blood and liver." Voprosy Meditsinskoi Khimii 15.4 (1969): 444-447.

Karpacheva, V. A. (1969). Use of direct spectrophotometry in UV for the determination of vitamin A in blood and liver. Voprosy Meditsinskoi Khimii, 15(4), 444-447.