Xiaofei Cao Sanjay Kumar Madria Efficient Data Collection in IoT Networks Using Trajectory Encoded With Geometric Shapes. 799-813 2022 7 IEEE Trans. Sustain. Comput. 4 https://doi.org/10.1109/TSUSC.2020.3044292 db/journals/tsusc/tsusc7.html#CaoM22