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. 2018 May 1;6:136. doi: 10.3389/fchem.2018.00136
Nucleophilic Fukui Function f+(r)=ρN+1(r)-ρN(r) Parr and Yang (1984)
Electrophilic Fukui Function f-(r)=ρN(r)-ρN-1(r) Parr and Yang (1984)
Dual Descriptor Δf(r)=(f(r)N)υ(r) Morell et al. (2005, 2006)
Nucleophilic Parr Function P-(r)=ρsrc(r) Domingo et al. (2013)
Electrophilic Parr Function P+(r)=ρsra(r) Domingo et al. (2013)