id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
crl-13150	Bulick, Stephen	Book Use as a Bradford-Zipf Phenomenon	1978	6	.pdf	application/pdf	2580	142	67	The underlying assumption of both forms of Bradford is the same: If items are ranked by productivity from high to low, there is a relationship between cumulative (and there- fore relative) productivity and the logarithm of cumulative items and thus the rank. Figure 1 shows a graph of cumulative transactions against cumulative items on a semi-log scale for the real data shown in table 1.	cache/crl-13150.pdf	txt/crl-13150.txt