Emilio Spedicato Elena Bodon Antonino Del Popolo Nezam Mahdavi-Amiri ABS methods and ABSPACK for linear systems and optimization: A review. 51-66 2003 1 4OR 1 http://dx.doi.org/10.1007/s10288-002-0004-0 db/journals/4or/4or1.html#SpedicatoBPM03