Relationship of Drought with Precipitation-Concentration Period and Precipitation-Concentration Degree in Ningxia in Spring, Summer and Fall
NA Li, ZHENG Guang-fen, REN Shao-yun, XU Jian-qiu
JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY . 2013, (4): 1015 -1021 .  DOI: 10.7522/j.issn.1000-0240.2013.0114

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