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Femtocell is a promising cost-effective technology to provide the hotspot coverage especially in buildings. Due to the high density of femtocells in urban environment, the need to reuse the scarce spectrum results in co-channel interference. In this paper, we propose a graph-based distributed scheme to manage radio resources efficiently among femtocells, achieving a good tradeoff between system throughput and user fairness. After the interference graph is generated, each femtocell first uses certain number of resources randomly. Then, femtocells may apply for more resources with the given probability. Our simulation results demonstrate the effectiveness of the proposed scheme in terms of throughput and fairness.