Kiselnikov Aleksander S., Solnyshkina Marina I. «Text complexity: study phases in Russian linguistics» // Tomsk State University Journal of Philology 2015. №6 (38) C.86-99
Glazkova Anna V. «Age Rating of Books and Readability: On the Correlation of Two Indices» // Text. Book. Publishing 2021. №26 C.129-142
