1. Pumping tests in patchy aquifers;Barker;Ground Water,1982
2. Butler Jr. , J. J. Pumping tests in nonuniform aquifers: A deterministic and stochastic analysis Stanford, Calif. 1986
3. Pumping tests in nonuniform aquifers-The radially symmetric case;Butler;J. Hydrol.,1988
4. The role of pumping tests in site characterization: Some theoretical considerations;Butler;Ground Water,1990
5. Butler Jr. , J. J. W. Z. Liu Analytical solutions for flow to a pumping well in nonuniform aquifers Kans. Geol. Surv. Open File Rep. 89-32 1989