RETINOL LEVEL IN PATIENTS WITH PSORIASIS DURING TREATMENT WITH B GROUP VITAMINS, A BACTERIAL POLYSACCHARIDE (PYROGENAL) AND METHOTREXATE (RUSSIAN) Статья Tishchenko L.D., Malkevich V.V. Vestnik Dermatologii i Venerologii. Том 51. 1975. С. 55-58