• A three-phase simplex method for infeasible and unbounded linear programming problemsÜbi, EvaldJournal of Mathematical and Computational Science2020 / p. 906-921 http://scik.org/index.php/jmcs/article/view/4387 https://doi.org/10.28919/jmcs/4387 https://www.scopus.com/sourceid/21100944441 https://www.scopus.com/record/display.uri?eid=2-s2.0-85083427155&origin=inward&txGid=c91b6f13c9a891c0564f6fdd5678d46f