@article {Ahmed1987WRR,
	title = {{Comparison of geostatistical methods for estimating transmissivity using data on transmissivity and specific capacity}},
	journal = {Water Resources Research},
	volume = {23},
	number = {9},
	year = {1987},
	pages = {1717-1737},
	author = {Ahmed, S. and {de Marsily}, G.}
}