00424nas a2200169   4500000000100000008004100001260000800042100001000050700001700060700001300077700001300090700001100103245010500114300001400219490000700233022001400240       2017                            d  cNov1 aJ. Du1 aErol Gelenbe1 aC. Jiang1 aH. Zhang1 aY. Ren00aContract Design for Traffic Offloading and Resource Allocation in Heterogeneous Ultra-Dense Networks  a2457-24670 v35  a0733-8716