Levin F.B. (1970) A rapid method of determining the concentration of phenylalanine in blood. Voprosy Meditsinskoi Khimii, 16(3), 326-329.

et al. A rapid method of determining the concentration of phenylalanine in blood // Voprosy Meditsinskoi Khimii. - 1970. - V. 16. -N 3. - P. 326-329.

et al., "A rapid method of determining the concentration of phenylalanine in blood." Voprosy Meditsinskoi Khimii 16.3 (1970): 326-329.

Levin, F. B. (1970). A rapid method of determining the concentration of phenylalanine in blood. Voprosy Meditsinskoi Khimii, 16(3), 326-329.