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Location-based services have become widely available on mobile devices. Existing methods employ a pull model or user-initiated model, where a user issues a query to a server which replies with location-aware answers. To provide users with instant replies, a push model or server-initiated model is becoming an inevitable computing model in the next-generation location-based services. In the push model, subscribers register spatio-textual subscriptions to capture their interests, and publishersdoi:10.1145/2487575.2487617 dblp:conf/kdd/LiWWF13 fatcat:lsthvpjfqjgvvmvx7i3owle5ci