Xu X D , Bian L G, Ding G A , et al . Technology and Principle of City Air Pollution ObservationField Experiment ( in Chinese ) . Beijing : China Meteorological Press , 2003
徐祥德，卞林根，丁国安等。 城市大气环境观测工程技术与原理。 北京：气象出版社，2003。
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The paper introduces a PC-E500program for settlement observationfield data col-lection, including its main functions and features, programing processes and several precautions in use.
Nassim Nicholas Taleb: the field of statistics is based on something called the law of large Numbers: as you increase your sample size, no single observation is going to hurt you.