Idf was launched as "phrase specificity" by Karen Spärck Jones in a 1972 paper. Although it has worked properly as a heuristic, its theoretical foundations have been troublesome for a minimum of a few many years afterward, with a lot of researchers attempting to discover details theoretic justifications for it.[seven] https://johnathanzdfed.educationalimpactblog.com/59389169/the-greatest-guide-to-invoice-financing