Zargaryan, Y. M., A. I. Vahanyan, N. P. Harutyunyan, E. G. Aghababyan, K. H. Begoyan, E. A. Mughnetsyan, and H. R. Hovhannisyan. 2005. “THE EFFECT OF DOPING ON THE SUPERCONDUCTIVITY OF THE YBa$_2$Cu$_3$O$_y$”. Proceedings of the YSU A: Physical and Mathematical Sciences 39 (2 (207). Yerevan, Armenia:46-51. https://doi.org/10.46991/PYSU:A/2005.39.2.046.