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\bibitem{Nivesanond_etal2005} {\textquotedblleft}\textit{Ab initio calculation of the interaction energy in the P2 binding pocket of HIV-1 protease}{\textquotedblright}. Nivesanond K, Peeters A, Lamoen D, van Alsenoy C, International Journal Of Quantum Chemistry \textbf{105}, 292 (2005).   http://doi.org/10.1002/qua.20724

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