Davidov, S. S. “ON PARASTROPHES OF ABELIAN INVERTIBLE ALGEBRAS”. Proceedings of the YSU A: Physical and Mathematical Sciences 42, no. 3 (217) (October 6, 2023): 39–43. Accessed November 23, 2024. https://pub.ysu.am/index.php/proceedings-phys-math/article/view/vol42_no3_2008_p039-043.