Levitskii A.P., Konovets V.M., Marchenko A.I., Volodkina V.V. (1973) Alkaline and acid phosphatase activity in human saliva in parodontosis. Voprosy Meditsinskoi Khimii, 19(2), 218-222.

Levitskii A.P. et al. Alkaline and acid phosphatase activity in human saliva in parodontosis // Voprosy Meditsinskoi Khimii. - 1973. - V. 19. -N 2. - P. 218-222.

Levitskii A.P. et al., "Alkaline and acid phosphatase activity in human saliva in parodontosis." Voprosy Meditsinskoi Khimii 19.2 (1973): 218-222.

Levitskii, A. P., Konovets, V. M., Marchenko, A. I., Volodkina, V. V. (1973). Alkaline and acid phosphatase activity in human saliva in parodontosis. Voprosy Meditsinskoi Khimii, 19(2), 218-222.