List of Articles Internal customers Open Access Article Abstract Page Full-Text 1 - Scale Survey of Internal Marketing and Effect on Quality Development of Service in Afshar Hospital S. M. Younesifar A. Sanayeei A. Shahin Open Access Article Abstract Page Full-Text 2 - Investigating the effective variables of R&D (research and development) and providing executive solutions to improve the learning performance and innovation of the National Iranian Gas Company Tavakol Moharrami Alireza Irajpour Morteza Mosakhani