Idf was introduced as "time period specificity" by Karen Spärck Jones in a very 1972 paper. Even though it has worked well to be a heuristic, its theoretical foundations are troublesome for at least a few many years afterward, with lots of scientists trying to uncover facts theoretic justifications for https://edwinyzxvs.bloggazza.com/36840658/the-best-side-of-trade-finance-transparency