Zhuravlev, Andrey V., Yadviga A. Vevel, Denis A. Gruzdev, and Andrey V. Erofeevsky. 2023. “Late Mississippian (early Serpukhovian) Carbon Isotope Record of Northern Laurussia: A Proposal for the Viséan Serpukhovian Boundary”. Revista Mexicana De Ciencias Geológicas 40 (1):35-43. https://doi.org/10.22201/cgeo.20072902e.2023.1.1722.