@article{qindong_liuke_hu_2021,  title={Gradient analysis of landscape pattern in the core area of the “Zhengzhou and Kaifeng Integration” at the landscape level},  volume={93},  ISSN={0001-3765},  url={https://doi.org/10.1590/0001-3765202120181159},  DOI={10.1590/0001-3765202120181159},  number={1},  journal={Anais da Academia Brasileira de Ciências},  publisher={Academia Brasileira de Ciências},  author={QINDONG, FAN and LIUKE, LIANG and HU, LI},  year={2021},  pages={e20181159} }