1. The drawdown of the water-table under non-steady conditions near a pumped well in an unconfined formation;Boulton,1954
2. Unsteady radial flow to a pumped well allowing for delayed yield from storage;Boulton;Publication de l'Assoc. Int. d'Hydrol. Assem. Gén. Rome,1955
3. Analysis of data from non-equilibrium pumping tests allowing for delayed yield from storage;Boulton,1963
4. Operational Methods in Applied Mathematics;Carslaw,1941