Nucleophilic Fukui Function	$f^{+}(\text{r})={\rho }_{N+1}(\text{r})-{\rho }_N(\text{r})$	Parr and Yang (1984)
Electrophilic Fukui Function	$f^{-}(\text{r})={\rho }_N(\text{r})-{\rho }_{N-1}(\text{r})$	Parr and Yang (1984)
Dual Descriptor	$\Delta f(\text{r})={(\frac{\partial f(\text{r})}{\partial N})}_{\upsilon (\text{r})}$	Morell et al. (2005, 2006)
Nucleophilic Parr Function	$P^{-}(\text{r})={\rho }_s^{rc}(\text{r})$	Domingo et al. (2013)
Electrophilic Parr Function	$P^{+}(\text{r})={\rho }_s^{ra}(\text{r})$	Domingo et al. (2013)