'HFB':['GGA_X_B88'],#['GGA_X_B88' + Becke’s 1988 exchange functional which includes the Slater exchange along with corrections involving the gradient of the density],
'HFB':['GGA_X_B88'],#['GGA_X_B88' + Becke's 1988 exchange functional which includes the Slater exchange along with corrections involving the gradient of the density],
'HFS':['LDA_X'],# Original HK/KS articles? No libxc name...