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• Lotfi.Heydar Investigation on Quantitative and Qualitative Indicators Affecting Housing and its Future Perspective in Esfarain City in Iran. [ Vol.6, Issue 21 - Spring Year 1388]
• Lotfi.Heydar The role of sustainable rural tourism for development of rural region in semnan providence (Case study, rural region in shahrood city) [ Vol.6, Issue 23 - Autumn Year 1388]
• Lotfi.Heydar An intelligent Hybrid Algorithm for Urban waste Collection Problem [ Vol.6, Issue 24 - Winter Year 1388]