183164 Gr graphene 511 180982 GN graphene 84 176708 GE graphene 36 181924 GP graphene 29 1008927 GRA graphene 29 1004076 GNP graphene 10 1006530 GPH graphene 6 172796 GA graphene 5 1010158 GRP graphene 2 178290 Gh graphene 2 911962 G/P graphene 1 1003845 GNH graphene 1 1009594 GRH graphene 1 1009900 GRn graphene 1