@article{zuo2020transport, title={Transport of intensity equation: a tutorial}, author={Zuo, Chao and Li, Jiaji and Sun, Jiasong and Fan, Yao and Zhang, Jialin and Lu, Linpeng and Zhang, Runnan and Wang, Bowen and Huang, Lei and Chen, Qian}, journal={Optics and Lasers in Engineering}, pages={106187}, year={2020}, publisher={Elsevier} }