Hakopian, H.A., and A.R. Malinyan. 2013. “ON $n$-INDEPENDENT SETS LOCATED ON QUARTICS”. Proceedings of the YSU A: Physical and Mathematical Sciences 47 (1 (230). Yerevan, Armenia:6-12. https://doi.org/10.46991/PYSU:A/2013.47.1.006.