List of Articles Clustering Open Access Article Abstract Page Full-Text 1 - Exact algorithms for solving a bi-level location–allocation problem considering customer preferences Ehsan Mirzaei Mahdi Bashiri Hossein Shams Shemirani Open Access Article Abstract Page Full-Text 2 - New spatial clustering-based models for optimal urban facility location considering geographical obstacles Maryam Javadi Jamal Shahrabi Open Access Article Abstract Page Full-Text 3 - Improving Network Energy Consumption Using Novel Proposed Geographic Routing with Mobile Sink in WSNs Gholamreza Farahani