@Article{Hao2021,
author="Hao, Xiaohua
and Huang, Guanghui
and Che, Tao
and Ji, Wenzheng
and Sun, Xingliang
and Zhao, Qin
and Zhao, Hongyu
and Wang, Jian
and Li, Hongyi
and Yang, Qian",
title="The NIEER AVHRR snow cover extent product over China -- A long-term daily snow record for regional climate research",
journal="Earth System Science Data",
year="2021",
volume="13",
pages="4711--4126"
}

@Article{ref2,
url="https://essd.copernicus.org/articles/13/4711/2021/"
}