5J. W. Tukey. Exploratory Data Analysis [M ]. Addision- Mesley Publishing Company, 1997.
6贾俊萍.统计学(第二版)[M].北京:清华大学出版社,2006.
7陈忠琏.探索性数据分析[M].北京:中国统计出版社,1997.
8MacCarthy P, Rice J A. Spectroscopic methods for determining functionability in humic substances[A]. Aiken G R (ed.). Humic Substances in soil, sediment and water[C]. New York: John Wiley and Sons Press,1985.527 - 543.
9Inbar Y, Chen Y, Hadar Y. Solid-state carbon-13 nuclear magnetic resonance and infrared spectroscopy of composted organic matter[J]. Soil Sci. Am. J.,1989,53: 1695 - 1701.