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This paper studies the resource allocation problem for spectrum-sharing femtocell networks. An auction-based algorithm, VCG auction, is proposed to ensure femtocell users submit their utilities truthfully despite the selfish nature of them, so that the resource allocation scheme works efficiently and fairly. We investigate the uplink transmission in a sparsely deployed scenario of Femto-network. By introducing the VCG auction mechanism, an optimum resource allocation scheme is obtained to enhance each femtocell user and the whole macrocell network's revenue both. Anyone who lie about his information will be penalized by extremely high payment and his revenues will decrease a lot. So, the users would rather tell the truth to obtain maximal revenue. Finally, numerical examples are presented to verify the proposed algorithm.