Fomina N. V. RussiaСамараSamara State Technical University. Chemical and technological faculty. Department of General and Inorganic Chemistry, 443100, Samara, Molodogvardeyskaya str., 244, the main buildingnkichimaeva@mail.ru Author's articles Мультипараметрическая идентификация нефтей Самарского региона Identification of Oils from Samara Region Using Principal Component Analysis and Factor Discriminant Analysis Influence of the Modifying Additive Nature on the Rheological Properties of the Concentrated Chitosan–Organic Acid–Water System