1. Remote sensing to identify spatial patterns in optimal rates of nitrogen fertilization;Blackmer,1996
2. Spatial relationships of soil nitrogen with corn yield response to applied nitrogen;Bruulsema,1996
3. Corn yield responses to dY predicted variable nitrogen fertilization: an Ontario field study;Cathcart,1999
4. MUCK — a novel approach to co-kriging;Clark,1989
5. Robust estimation of the variogram;Cressie;Mathematical Geology,1980