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In hybrid vehicular ad hoc networks (VANETs), content data can be downloaded either from 3G/4G cellular networks or from roadside units (RSUs) of VANETs. When downloading via cellular networks, the delay is low but the cost is expensive. While, downloading via VANETs, the cost is nearly free. However, due to the unique characteristics of VANETs, such as frequent disruptions, high speed mobility and...