Arabyan, O.A. “ABOUT A CLASS OF THREE-DIMENSIONAL SUBMANIFOLDS IN AFFINE SPACE $ A^6 $”. Proceedings of the YSU A: Physical and Mathematical Sciences 52, no. 3 (247) (December 17, 2018): 157–160. Accessed May 15, 2024. https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol52_no3_2018_pp157-160.