@Article{hess-13-1123-2009,
AUTHOR = {de Rooij, G. H.},
TITLE = {Averaging hydraulic head, pressure head, and gravitational head in subsurface hydrology, and implications for averaged fluxes, and hydraulic conductivity},
JOURNAL = {Hydrology and Earth System Sciences},
VOLUME = {13},
YEAR = {2009},
NUMBER = {7},
PAGES = {1123--1132},
URL = {http://www.hydrol-earth-syst-sci.net/13/1123/2009/},
DOI = {10.5194/hess-13-1123-2009}
}