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It is often possible to save storage space in a computer by storing only the differences among data items rather than the entire items. For example, suppose we have two records A and B. We should store all of A, then for B store a pointer to A and the differences between A and B. If A and B are similar, there will be few differences and storage space can be saved.
Analysis of algorithms, memory storage reduction, minimal spanning trees, spanning forests.

A. Kang, n. Chin-Liang Chang, n. Shi-Kuo Chang and R. Lee, "Storage Reduction Through Minimal Spanning Trees and Spanning Forests," in IEEE Transactions on Computers, vol. 26, no. , pp. 425-434, 1977.
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