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A major topic among the current researches on energy is a sustainable energy development and assessment. An importance of energy system is obvious in our life. There are many important energy applications. There are heating and cooling, power generation, desalination, air conditioning and so on. By the year 2020 world will need 50% more energy than today and the Asia-Pacific region will become world's largest consumer of energy. In 21-st century, world faces with the challenge of converting its fossil fuels energy base to the sustainable energy sources. Regarding the increasing rise of the energy demand and consumption, virtually everyone in the world must implement an integrated resource planning (IRP). It is vitally important to achieve sustainable growth. Sustainability assessment of energy system is one of the important issues in policy making all around the world. Decision making on energy system is very risky and difficult and therefore cannot be individual. Multi Criteria Decision Making (MCDM) is a renowned methodology in decision making and evaluation. Some of the most famous MCDM tools are as following:

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This paper aims to study the progress of research on Sustainable Tourism and to outline and identify the key disciplines, journals, articles and authors. This is carried out through a wide, in-depth, and structured examination of published scholarly papers. In recent decades, sustainable tourism has been one of the most significant subjects among academics and practitioners. In this paper, a classification scheme and a comprehensive literature review are presented in order to clarify, categorise, and interpret the current research on sustainable tourism definitions and applications. The classification scheme for this review contains 132 scholarly papers from 47 journals since the year 1993 up to 2013 categorised into 14 application areas. The five major topics are Paradigm, Sustainable Tourism Development, Market research and Economic, Policy-making, and Infrastructure. The scholarly papers are also sorted by (we suggest using the exact order used later in the paper) (1) year of publication; (2) publication journal; (3) subject area citations. It is hoped that this paper provides the needs of researchers and practitioners with easy references for sustainable tourism and its definitions and applications, and also presents future research opportunities.