CHRZANOWSKI, A. Integration of the Global Positioning System with geodetic levelling surveys in ground subsidence studies. Proc. 5th Int. (FIG) Sympo. on Deformation Measurements and 5th Canadian Sympo. on Mining Surveying and Rock Deformation Measure. 1988, 142-155
MURRIA, J. Engineering and construction in areas subjected to subsidence due to oil production. 1988, 367-373