The Prisayan Formation (Lower and Middle Jurassic) of the Irkutsk Coal Basin: New data on litho- and phytostratigraphy / A. O. Frolov, S. V. Ivantsov, I. V. Afonin [et al.] // Russian geology and geophysics. 2022. Vol. 63, № 10. P. 1133-1161. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/koha:001008410