1. Selection techniques in sampling spatial units;Arbia;Quad. Statist. Mat. Applic. Sci. Econ. Socl.,1994
2. Evaluating and updating the sample design in repeated environmental surveys: monitoring air quality in Padua;Arbia;J. Agric. Biol. Environ. Statist.,,1997
3. Arbia, G. and Switzer, P. (1994) Spatial sampling designs for stratified correlated units with unequal variances. Technical Report 94.6. Department of Statistical Sciences, University of Padua, Padua.