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pi-bond1947
1947 Q. Rev. Chem. Soc.1 157 A double bond is normally a σ-bond and a π-bond together.
2000 Proc. National Acad. Sci. U.S.A.97 12195/2 The modeling and energy minimization of the Fab-C60 complex suggests several pi-bond stacking interactions between the fullerene and the antibody.