篇号：
题名：A Soil-Quality Index and Its Relationship to Efficiency and Productivity Growth Measures: Two Decompositions
作者：
Edward C. Jaenicke and Laura L. Lengnick
期刊全称或缩写：American Journal of Agricultural Economics,
年份，卷（期），起止页码： Vol. 81, No. 4 (Nov., 1999), pp. 881-893
(article consists of 13 pages)
电子链接：http://www.jstor.org/stable/1244331