Research on External Signs and Chemical Composition of Medicinal Plant Raw Material -Leaves of Ficus Elastica, Strelyaeva, Angelina V., Kharitonova Anna G., Vaskova Larisa B., Luferov Alexander N., Bokov Dmitry O., Bondar Alina A., Bobkova Natalia V., Jeremic Nevena, Lazareva Yulia B., Antsyshkina Alla M., et al. , Pharmacognosy Journal, January 2023, Volume 14, Issue 6s, p.958-972, (2022)