Давнис, Валерий Владимирович, Сергей Евгеньевич Касаткин, and Андрей Юрьевич Разинский. “Interior Index Models and Their Application in Problems of Portfolio Investment”. Modern Economics: Problems and Solutions 1 (April 18, 2015): 137-145. Accessed December 5, 2025. https://journals.vsu.ru/meps/article/view/8003.