Comparison study of CC and CH vibration frequencies and eelectronic properties for mono, Di, Tri, and tetra-rings layer of arm chair (SWCNTs). IJP [Internet]. 2019 Feb. 25 [cited 2024 Apr. 29];11(20):85-99. Available from: https://ijp.uobaghdad.edu.iq/index.php/physics/article/view/386