1. Optimal designs for sampling intwo dimensions;Bellhouse;Biometrika,1977
2. Spatial sampling on the presence of a trend;Bellhouse;J. Statist. Plan. Infer.,1981
3. Systematic sampling, to appear;Bellhouse,1983
4. On plane sampling and related geometrical problems;Dalenius,1960
5. Two-dimensional systematic sampling and the associated stratified and random sampling;Das;Sankhyā,1950