List of articles (by subject) Calculus of variations and optimal control; optimization Open Access Article Abstract Page Full-Text 1 - A variational approach to quasilinear elliptic systems with critical Hardy-Sobolev and sign-changing function exponents A. Akhavan 10.30495/jlta.2023.1995617.1587 20.1001.1.22520201.2023.12.03.3.5 Open Access Article Abstract Page Full-Text 2 - A generalized cost Malmquist index to compare the productivities of units with negative data in DEA G. Tohidi S. Razavyan S. Tohidnia 20.1001.1.22520201.2014.03.02.6.3