1. On practical systematic sampling;Aoyama;AISM,1951
2. Systematic sampling in the presence of a trend;Bellhouse;Biometrika,1975
3. Optimal designs for systematic sampling in two dimensions;Bellhouse;Biometrika,1977
4. Spatial surveys in the presence of a trend;Bellhouse;JSPI,1981
5. Evolution of the sample design of the Indian National Sample Survey;Bhattacharyya;Sankhyā C,1981