Assessment of the Perdew–Burke–Ernzerhof exchange-correlation functional

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Machine learning of molecular electronic properties in chemical compound space (2013, methodology): “Polarizabilities, calculated using PBE0, or with the more approximate self-consistent screening (SCS) model29, are strongly correlated.”
Orbital-dependent density functionals: Theory and applications (2008, background): “Fortunately, for the nonempirical PBE GGA, b=0.25 is found to be an excellent value Adamo and Barone, 1999; Ernzerhof and Scuseria, 1999 .”