Для цитирования:

Петроченков Д.А. Геммологические характеристики ювелирно-поделочных септарий Ульяновской области. Proceedings of Higher Educational Establishments: Geology and Exploration. 2019;(2):21-27. https://doi.org/10.32454/0016-7762-2019-2-21-27

For citation:

Petrochenkov D.A. Gemological characteristics of jewelry-ornamental septaria of the Ulyanovsk region. Proceedings of higher educational establishments. Geology and Exploration. 2019;(2):21-27. (In Russ.) https://doi.org/10.32454/0016-7762-2019-2-21-27