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The co-channel interference arising from the unplanned deployment and autonomous operation of self-organized femtocells is the most challenging obstacle to the viability of such architecture. Herein, we provide an analytical framework for assessing the uplink interference of indoor deployment scenario. The proposed model resorts to Gauss-Hermite quadrature to obtain an approximation to the total interference perceived by a tagged receiver, and stochastic geometry to model the distribution of nodes and their relative separation distances. Furthermore, the benefit of coordinating nearby femtocells so as to perform interference avoidance is also assessed. We observe that analytical results match well with simulation results. And yet, through coordination, it is possible to improve spatial reuse, reduce outage, and attain not only higher spectral efficiency, but also increased capacity.