R. Peverati, Y. Zhao and D. G. Truhlar, “Generalized Gradient Approximation That Recovers the Second-Order Density-Gradient Expansion with Optimized Across-the-Board Performance,” J. Phys. Chem. Lett. 2 (2011) 1991-1997. DOI: 10.1021/jz200616w
R. Peverati, Y. Zhao and D. G. Truhlar, “Generalized Gradient Approximation That Recovers the Second-Order Density-Gradient Expansion with Optimized Across-the-Board Performance,” J. Phys. Chem. Lett. 2 (2011) 1991-1997. DOI: 10.1021/jz200616w
