【题 名】： Variogram fitting with a general class of conditionally nonnegative definite functions
【作 者】：A. Shapiro and J. D. Botha
【期刊、会议、单位名称】：Computational Statistics & Data Analysis
【年, 卷(期), 起止页码】：Volume 11, Issue 1, January 1991,Pages 87-96  
【全文链接】：http://dx.doi.org/10.1016/0167-9473(91)90055-7