@book{145839,
	author = {Boonstra, J. and Ridder, Nicholaas Arie de.},
	title = {Numerical modelling of groundwater basins :},
	publisher = {International Institute for Land Reclamation and Improvement,},
	year = {1981.},
	series = {International Institute for Land Reclamation and Improvement. Publication ;},
	address = {Wageningen :},
	note = {Includes indexes.}
}