“The Hydrogen Passivated Graphene Cluster and its Stability - First Principle DFT (B3LYP) Levels of Approximation with the Basis Set 3-21G”, Kathford J. Eng. Mgt., vol. 1, no. 1, pp. 5–10, Dec. 2018, doi: 10.3126/kjem.v1i1.22013.