20210207001800.0 1861-2067 1861-2067 1861-2059 http://www.springeronline.com/sgw/cda/frontpage/0,11855,1-164-2-99627-0,00.html Transactions on rough sets (Internet) Transactions on rough sets (Internet) Germany Transactions on rough sets. 1861-2067 1861-2067 Transactions on rough sets.