1. An empirical study of probability sampling designs;Bellhouse;Conad. J. Archaeology,1979
2. Systematic sampling in the presence of a trend;Bellhouse;Biometrika,1975
3. Some optimal designs for sampling in two dimensions;Bellhouse;Biometrika,1977
4. Sampling Techniques;Cochran,1977
5. Two-dimensional systematic sampling and the associated stratified and random sampling;Das;Sankhya,1950