1. Lutskaya IK. Manifestations of the oral mucosa of diseases of internal organs and AIDS. International Reviews: Clinical Practice and Health. 2013;6:32–53 (In Russ).
2. Emelyanova AYu, Zinovieva OE. Vitamin B 12 in the treatment of diseases of the nervous system. Russian Medical Journal. 2016;7:429–33 (In Russ).
3. Krasnovsky AL, Grigoriev SP, Alyokhina RM, Ezhova IS, Zolkina IV, Loshkareva EO. Current diagnostic and treatment options for vitamin B 12 deficiency. Clinician. 2016; 3:15–25 (In Russ).
4. Sakhin VT, Kryukov EV, Mittens OA. Anemia of chronic diseases features of pathogenesis and an attempt to classify. Pacific Medical Journal. 2019;1:33–7 (In Russ).
5. Magomedova MA, Arbukhanova MS, Gazimagomedova MM, Khalilov HKh. Pathochemical mechanisms of manifestation of various types of hypovitaminosis in the oral cavity. The Successes of Modern Science. 2017;1:44–9. (In Russ).