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2. Data compaction in NOMIS: A geographic information system for the management of employment, unemployment and population data;Blakemore;University Computing,1985
3. NOMIS — A national geographic information system for the management andmapping of employment, unemployment and population data;Nelson;ACSM-ASPRS Annual Convention,1986
4. Signed chi-square for inter-areal comparisons;O'Brien,1989