List of Articles Fuzzy relation Open Access Article Abstract Page Full-Text 1 - Increasing discrimination efficiency in data envelopment analysis with imprecise input and output Saeid Shahghobadi Farhad Moradi Abas Ghomashi Open Access Article Abstract Page Full-Text 2 - Linear optimization of fuzzy relation inequalities with max-Lukasiewicz composition E. Shivanian Open Access Article Abstract Page Full-Text 3 - Fuzzy number-valued fuzzy relation M. Adabitabar ‎Firozja‎ S. ‎Firouzian‎ Open Access Article Abstract Page Full-Text 4 - Rough Set in Fuzzy Approximation Space with Fuzzy Equivalence Class Mohadeseh Taginejad