HYDROGEN PENTAGRAPHENELIKE STRUCTURE STABILIZED BY HAFNIUM: A HIGH-TEMPERATURE CONVENTIONAL SUPERCONDUCTOR Article Xie H., Duan D., Song H., Zhang Z., Jiang S., Cui T., Yao Y., Feng X., Redfern S.A.T., Pickard C.J., Kresin V.Z. Physical Review Letters. Vol. 125. 2020. 217001 p.