List of Articles Reciprocity Open Access Article Abstract Page Full-Text 1 - Variational Principle, Uniqueness and Reciprocity Theorems in Porous Piezothermoelastic with Mass Diffusion R Kumar P Sharma Open Access Article Abstract Page Full-Text 2 - Jurisprudential and legal principles of adherence to international negotiations and agreements javad oliyae tayebe aref nya Open Access Article Abstract Page Full-Text 3 - Barriers to Participation of Developing Countries in the WTO's Dispute Settlement System Dydokht Sadeghi – Haghighi Leila Reisi